As you may have heard on my last YouTube video, I've been looking forward to the new dragons in Galactic Overlord/Dragons Collide. Many people having been bashing the 'Chaos Dragons', and while they aren't the best cards for a typical Disaster Dragon deck, they do have their niche to fill. Galactic Overlord has several dragons that will be good for all dragon decks: A multitude of powerful xyz and an awesome new archetype. In this post I'll go over some of the best ones from each set.
Dragons Collide

This guy was quite terrifying when the first spoiler was released, but a text change saved us all from another Hanewata format. Basically, when this guy hits the grave you get to revive a Red-Eyes Darkness Metal Dragon(REDMD). Great for chaining Call of the Haunted, Torrential Tribute, etc. Think of him as a Decoy Dragon with 2500 attack and less restrictive conditions. Speaking of which, 2500 attack on a level 6. That's incredible. This helps to make him less of a dead draw as you can normal summon him quite easily. His 'Chaos' aspect is pretty neat as well, although rather lackluster in standard Disaster. In addition to a traditional Chaos summon, he's also got a Dark Simorgh-esque summon. It also gives you an easy way to get a REDMD in the grave for his effect(and makes for a more powerful Future Fusion opening). Finally, him being level 6 is important thanks to a new xyz in Galactic Overlord. All in all, he's a pretty good card, but doesn't fit into most Disaster Dragon decks. One exception to that is my Egg build that I recently posted on YouTube, that can easily run multiple tribute monsters with ease. With Torrential Tribute coming to 2 and Call being unlimited, this in definitely a card to look out for.

Also known as Garchomp. While I was more excited for him when Pulsar had the text change, he hasn't played too spectacularly in my deck. A unique thing about Darkflare is that sending from the deck to the grave is a cost, so veiler/fiendish chain can't stop his toolboxing. I believe the reason he didn't shine too much in my deck is that Dragon Ravine already provided enough toolboxing for me, and the banishing effect is only useful in certain matchups. Being level 5 hurts him as well, as he can't be used for the new rank 6 dragon. Still, he's a great card in his own right, and I'm currently trying to put more pressure on him by taking out my copies of Terraforming. He's probably a better choice for standard Disaster Dragon than Pulsar at the moment, if only as a side deck option.

Probably the card most dragon players were looking for in the new deck, basically a REDMD in trap form. Except where REDMD is a +1, this card is normally a -1. Many might ask: "Why not just use Call of the Haunted instead?". The answer is that this card:
1. Doesn't target
2. Can summon REDMD even with Koa'ki Meiru Drago on the field
3. Isn't negated by S/T removal
Similar to Burst Breath, one would want to use this card when the opponent activates something that would get rid of your on-field dragon anyway. One could even argue that this card is better than Burst Breath, as it can summon any dragon from your hand/grave, where Burst Breath can only destroy some monsters. I personally haven't done any testing with it, but it certainly has the most potential for use in standard Disaster Dragon decks out of the new cards.
Galactic Overlord
This set has quite a few new dragons, most notably the new 'Hieroglyph'(Holy Marked in the OCG) archetype that focuses on spamming their level 8 vanilla dragon for quick xyzs. While I thought it was different in my past YouTube video, it turns out the effect that all the Hieroglyphs have is: Special Summon 1 Dragon-Type Normal Monster from your hand, Deck, or Graveyard, but its ATK and DEF become 0. This means that they are able to summon Blue-Eyes White Dragon, making them great support for the Egg, as well as decks focusing on Red-Eyes B. Dragon.
Hieroglyphs
GAOV-JP019
Seikokuryuu - Dragongeiv (Geb, the Holy Marked Dragon)
Light Dragon / Effect
LV4 1800/400
When this card destroys an opponent's monster by battle and sends it to the Graveyard: Special Summon 1 Dragon-Type Normal Monster from your hand, Deck, or Graveyard, but its ATK and DEF become 0. When this card is Released: Special Summon 1 "Seikoku" Normal Monster from your hand, Deck, or Graveyard.
Basically a Shura for the archetype. 1800 attack, when it destroys a monster by battle you get to summon a BEWD/REBD. Its second effect relates to their 'shine ball', a level 8 0/0 vanilla dragon. A good card, not quite sure how it'll fare in the Egg just yet.
GAOV-JP020
Seikokuryuu - Asetdragon (Isis, the Holy Marked Dragon)
Light Dragon / Effect
LV5 1900/1200
You can Normal Summon this card in face-up Attack Position without Releasing monsters. If you do, this card's original ATK becomes 1000. Once per turn: You can target 1 face-up Dragon-Type Normal Monster; until the End Phase, the Levels of all "Seikoku" monsters on the field become the same as it. When this card is Released: Special Summon 1 Dragon-Type Normal Monster from your hand, Deck, or Graveyard, but its ATK and DEF become 0.
An easy way to get out xyzs quickly. While its stats leave much to be desired, you can summon it while you've got a BEWD on the field to get out an instant rank 8. The effect that triggers when it's tributed can also grab BEWD, so if you tribute it for say redmd, along with another Hieroglyph, you can instantly get out something huge like Thunder-End Dragon or Neo-Galaxy Photon Dragon. This card serves its purpose well as a great follow-up to something like a Geib play, easily getting out the boss monster of the Archetype.
GAOV-JP021
Seikokuryuu - Nepthedragon (Nephthys, the Holy Marked Dragon)
Light Dragon / Effect
LV5 2000/1600
You can Special Summon this card (from your hand) by Releasing 1 "Seikoku" monster you control. Once per turn: You can release 1 other "Seikoku" monster you control or in your hand to target 1 monster your opponent controls; destroy that target. When this card is Released: Special Summon 1 Dragon-Type Normal Monster from your hand, Deck, or Graveyard, but its ATK and DEF become 0.
And here start the big plays. A nice card for the archetype, but lets take a look at what it can do for the Egg:
First off, it can tribute itself to summon itself. Meaning, you could summon it with its effect, summon another, and BAM! Thunder End/Boss monster. Because of how the archetype works, its summoning conditions end up not minus-ing you. A great play for this card is:
1.Special Summon a Hieroglyph that summons a bewd when tributed(or simply already have one on the field.
2. Tribute it to summon this guy, along with a BEWD.
3. Tribute this guy to summon Light Pulsar Dragon, summoning a second BEWD.
4. Xyz summon Thunder-End, blow up the field and grab yourself a REDMD from the grave.
5. Summon the BEWD you just detached and swing for game.
GAOV-JP023
Seikokuryuu - Shiyuudragon (Shu, the Holy Marked Dragon)
Light Dragon / Effect
LV6 2200/1000
You can Special Summon this card (from your hand) by Releasing 1 "Seikoku" monster you control. Once per turn: You can Release 1 other "Seikoku" monster you control or in your hand to target 1 Spell/Trap Card your opponent controls; destroy that target. When this card is Released: Special Summon 1 Dragon-Type Normal Monster from your hand, Deck, or Graveyard, but its ATK and DEF becomes 0.
This guy is basically a beefier version of Nephthys that destroys backrow instead of monsters. He's the superior version to run in The Egg, as being level 6 is important for the new rank 6. Another combo a forgot to mention with these guys involves Galaxy-Eyes Photon Dragon.
1.Special Summon a Hieroglyph that summons a bewd when tributed(or simply already have one on the field.
2. Tribute it to summon this guy, along with a BEWD.
3. Tribute BEWD to summon Light Pulsar Dragon
4. Tribute this guy and LPD to summon GEPD, along with REDMD and BEWD.
5. You've got enough for game, but for overkill you can use redmd to summon another BEWD, and xyz summon Neo-Galaxy Eyes Photon Dragon.
GAOV-JP022 - Rare
Seikokuryuu - Tofenidragon (Tefnut, the Holy Marked Dragon)
Light Dragon / Effect
LV6 2100/1400
If your opponent controls a monster while you control no monsters, you can Special Summon this card (from your hand). If you do, this card cannot attack during this turn. When this card is Released: Special Summon 1 Dragon-Type Normal Monster from your hand, Deck, or Graveyard, but its ATK and DEF become 0.
Another Cyber Dragon for us dragon players. Except this one isn't as wimpy as Vice Dragon, and is level 6 to boot! A pretty straightforward card, he's what makes crazy plays possible with Shu and Nephthys. He might see some play in standard Disaster as well, since a Level 6 Cyber Dragon for us is pretty damn good.
GAOV-JP024 - Rare
Seikokuryuu Usirdragon (Osiris, the Holy Marked Dragon)
Light Dragon / Effect
LV7 2600/700
You can Special Summon this card (from your hand) by banishing 1 LIGHT Dragon-Type monster and 1 Dragon-Type Normal Monster from your Graveyard. If this card on the field would be destroyed, you can Release 1 other face-up "Seikoku" monster you control instead.
A mini-boss for the archetype, pretty sweet for a pure build, but lackluster for hybrids. I really like the summoning requirements though.
GAOV-JP025 - Super Rare
Seikokuryuu Setekdragon (Set, the Holy Marked Dragon)
Light Dragon / Effect
LV8 2800/2000
Cannot be Normal Summoned or Set. Must first be Special Summoned (from your hand) by banishing 3 Dragon-Type Normal Monsters in your Graveyard. Once per turn: You can banish 1 Dragon-Type monster from your Graveyard to target 1 card on the field; destroy that target.
The Archetype's DAD. Unfortunately summoning him means banishing your entire engine, unless you pull together some sweet Alexandrite Dragon build. Personally I don't think it's worth the space; I'd rather have 3 BEWD looping around than a once-per-turn-DAD.
GAOV-JP047 - Super Rare
Seikokuryuuou Atums (Atum, the Holy Marked Dragon Emperor)
Light Dragon / Xyz / Effect
RK6 2400/2100
2 Level 6 Dragon-Type monsters
Once per turn: You can detach 1 Xyz Material from this card; Special Summon 1 Dragon-Type monster from your Deck, but its ATK and DEF become 0. This card cannot attack during this turn.
This is the card I've been talking so much about. Hopefully now you see why level 6 dragons are so important. This guy summons any dragon from your deck, the only stipulation being that it can't be used for battle(0atk/def isn't very threatening) and Atum can't attack that turn. Summon REDMD, use his effect. Summon a tuner, sync with it. Summon a hieroglyph and tribute it for more loops. I just can't say enough about this card. Who knows how high Konami will rarity bump this, I wouldn't be surprised to see a Secret Rare.
GAOV-JP048 - Ultra Rare / Ultimate
Seikokushinryuu Ennead (Ennead, the Holy Marked Divine Dragon)
Light Dragon / Xyz / Effect
RK8 3000/2400
2 Level 8 monsters
Once per turn: You can detach 1 Xyz Material from this card; Release any number of monsters you control or in your hand, and destroy up to that many cards on the field.
The boss for this archetype. While 2 generic level 8s is a bit scary(Grapha, Grapha everywhere), it does make for Mind Control becoming a key card in this deck. That 0/0 BEWD you have can fuse with your opponent's Stardust Dragon into this big dude. Also, Van'Dalgyon becomes this guy instant should you negate an opponent's monster effect. This card is also interesting in that it can tribute cards from your hand(similar to rituals), so you can trigger your Hieroglyph effects from your hand. I'm not sure for the rulings on this, but it appears than tributing and destroying cards are both the effect, so optional effects(like LPD) may work with this guy. Luckily all the Hieroglyph monster's have mandatory effects, so he'll be amazing either way.
GAOV-JP056 - Rare
Shoushuu no Seikokuin (Holy Marker of Gathering)
Spell Normal
Add 1 "Seikoku" monster from your Deck to your hand.
That's right, any monster. Go ahead, grab that cyber dragon and summon it. Need Shu to get your loop going? Well just add it to your hand! Seriously, this is what would make that Cyber Dragon worth running in standard Disaster Dragon. Not only is a a cyber dragon we can use for Atum, but there's a rota for it. Also, this card makes the archetype extremely viable.
GAOV-JP071 - Rare
Massatsu no Seikokuin (Holy Marker of Obliteration)
Trap Normal
Release 1 "Seikoku" monster you control to target 1 card your opponent controls; banish that target.
Yep, good S/T support. They get their own Oblivion Ring. While this card might not make it into a deck teching a few Hieroglyphs, you better believe it's going to be used in a pure deck.
GAOV-JP057
Chouryoku no Seikokuin (Holy Marker of Supreme Force)
Spell Normal
Special Summon 1 "Seikoku" monster from your hand.
Just a way to get combos going. Probably won't be used much in Hybrids due to the inherent -1.
GAOV-JP072
Hansha no Seikokuin (Holy Marker of Reflections)
Trap Counter
When an Effect Monster's effect or a Spell/Trap Card is activated: Release 1 "Seikoku" monsters you control; negate that activation and destroy that card.
Well this seems totally fair. A counter trap you can use to easily get your effects off. While normally these type of counter traps suck, because of the focus on tributing monsters in the archetype this one is quite good. Personally I prefer Champion's Vigilance though.
Other GAOV Dragons
GAOV-JP001
Elekiterudragon (Wattdragon)
Light Dragon
LV6 2500/1000
A dragon who's constantly surrounded by electricity that floats in midair. It has existed since the ancient times, but its ecology remains a mystery. Due to Ancient Rules, capturing of it has been prohibited.
Why am I mentioning a new vanilla? Well if you noticed, he happens to be level 6. Meaning Tefnut->Shu=Atum. Without normal summoning, you just got a turn 1 Atum. I'm going to try one of these in the Egg hybrid I'm working on, since you can recycle him from the hand/deck/grave.
GAOV-JP041 - Ultra Rare / Ultimate Rare / Holographic Rare
Neo Galaxy-Eyes Photon Dragon
Light Dragon / Xyz / Effect
RK8 4500/3000
3 Level 8 monsters
When this card is Xyz Summoned using "Galaxy-Eyes Photon Dragon" as an Xyz Material: Negate the effects of all other currently face-up cards on the field. Once per turn: You can detach 1 Xyz Material from this card; detach all Xyz Materials from Xyz Monsters your opponent controls. During this turn, this card gains 500 ATK for each Xyz Material detached, and can attack a maximum numbers of times equal to the amount of Xyz Materials detached during the same Battle Phase.
What a monster. And he can be summoned easily in the egg/hieroglyphs... oh boy. Basically the Trident Dragion of ZeXal, he is going to be a ton of fun to use. Not much more I can say, 4500 beatstick than negates every other face-up card on summon.
GAOV-JP046 - Super Rare
Jinrai no Kishi Gaia Dragoon (Gaia Dragoon the Thunderous Knight)
Wind Dragon / Xyz / Effect
RK7 2600/2100
2 Level 7 monsters
You can also Xyz Summon this card by using 1 Rank 5 or 6 Xyz Monster you control as the Xyz Material. (Xyz Materials attached to that monster also become Xyz Materials for this card.) If this card attacks a Defense Position monster, inflict piercing Battle Damage to your opponent.
The summoning conditions are what make this guy worth running. Use a spent xyz to bring out this guy, heck you can just revive one with redmd and summon him. Best of all it doesn't need xyz materials for its effect. Mind Control on your opponent's big xyzs is another great play with this gaia.
GAOV-JP049 - Rare
Ryuumajin Queen Dragun (Queen Dragun the Dragon Majin)
Dark Dragon / Xyz / Effect
RK4 2200/1200
2 Level 4 monsters
Dragon-Type monsters you control, other than "Ryuumajin Queen Dragun", cannot be destroyed by battle. Once per turn: You can detach 1 Xyz Material from this card to target 1 Level 5 or higher Dragon-Type monster in your Graveyard; Special Summon that target, but its effects on the field are negated, and it cannot attack during this turn.
Now here's a great card for Disaster Dragon. A good +1ing rank 4 xyz. She can provide a measure of protection for your KKM Drago(although you can't summon her with him on the field), and revives an army of beatsticks. The best card to revive with her is probably Light Pulsar Dragon, and you'll still get to revive REDMD if it somehow dies.