Combo explaination. I think each one needed a panel apart becouse they're not exactly easy to understand
Voltron Scion Vest
The most serious combo and the fastest way the deck has to kill, useful if at the table there is some opponent particularly indigestible
The aim is to go Voltron with a single attack by putting two times Scion ability on the stack before the first resolves, first targeting Dragon Tyrant and then Moltensteel Dragon. This way Scion turns first into Moltensteel, then into Tyrant, and while Scion is Moltensteel you can use its ability and pay lifes to pump him. The pump will stay on it even when it turns into Tyrant, so if you paid 10 lifes it gets +5/+0 until end of turn (note that every red mana you can pay in this moment saves you 2 life). Then, when it turns into Tyrant, it will be an 11/6 flying trumple double-attack ready to do Voltron. The Tyrant can be replaced with Atarka, World Render
The weakness to do Voltron like this is to cut your lifes before the attack goes well since even a Doom Blade could kill Scion in the moment between attack declaration and damage assignment
Worldgorger is Drunk
Worldgorger Dragon is that friend that every party needs but you wouldn't invite at your wedding. He is fun, becouse when is into your graveyard you can go for infinite mana just targeting him with Animate Dead, but he also doesn't know when to stop himself, and sometimes he causes the match ends into a draw or, worse, sends all your permanents to hell
To put it simple, once Worldgorger Dragon is in your graveyard and you cast Animate Dead targeting it, Worldgorger enters the battlefield causing it to exile all other permanents you control, Animate Dead included. This causes its LtB ability to trigger and Worldgorger Dragon sacrificed. Now all permanents exiled before re-enter the battlefield (untapped), even Animate Dead. Here all you have to do is to target Worldgorger Dragon with Animate Dead again and to tap all your lands and mana rocks for mana. Now Worldgorger Dragon comes back to the field and the loop perpetuates, giving you the opportunity to accumulate all mana you want. To get out of the loop at a certain point you have to target a creature different from Worldgorger Dragon with Animate Dead or the match will end in a draw, so make sure he isn't the only creature in graveyards. Note that Animate Dead is replaceable both by Necromancy and Dance of the Dead.
Once you have infinite mana, the easyest way to win is to play Scion, turn it into Niv-Mizzet, Dracogenius and using its ability to deal infinite damages to your opponents. If someone is untargettable (maybe becouse of a Leyline of Sanctity) still you can draw your library until you get a ton of dragons and a way to give them haste like Dragon Tempest for a massive attack
The weakness now is about Worldgorger Dragon himself, since if someone kills him before his EtB ability resolves, his LtB ability will resolve first, causing your permanents leaving the battlefield at the end of the stack forever becouse the effect that make exiled cards re-entering the battlefield have already resolve. If you want to play this combo I recommand to wait your opponents go TappedOut or, otherwise, make sure you have Steely Resolve or Dragonlord Dromoka on the field (the real one, a Scion Vest wouldn't work)
Is Bladewing Drunk too?
Bladewing the Risen isn't a dude that can go drunk easily, but if you joke him by putting him in front of a perfect copy of himself he'll remember when he was two separated dragons and he'll go crazy like Worldgorger does
If possibile, this one is even more hard to understand than the previous two, but basically it works thanks to the Legendary Rule, and all you need is Scion on the field and a reanimation in hand. Activate Scion ability and search your library for Bladewing the Risen and put it into your graveyard. Scion becomes a copy of Bladewing until end of turn. Now cast your reanimation and target Bladewing, so you move it from your graveyard to the battlefield. This triggers the EtB ability of Bladewing but there is a state-based action about the Legendary Rule to process first since Scion is still a copy of Bladewing. You choose the Scion copy to keep and put the original one in your graveyard (note that this is neither a trigger nor a sacrifice). Now the triggered ability before mentioned goes on the stack and you can target Bladewing himself. When the ability resolves you'll have two Bladewing into battlefield again, and here's the loop. Once you go for infinite creatures that hit the field everything with a "When a Dragon enter the battlefield" ability will trigger ad nauseam, so if you had Scourge of Valkas or Dragon Tempest you can do infinite damages, if you have Lathliss, Dragon Queen you'll create infinite Dragons, while if you have Kindred Discovery, Temur Ascendancy or Garruk's Uprising you can literally draw your library, a thing that can give you all the ways you want to win. To stop the loop make sure you have another legal target in your graveyard to targeted with Bladewing the Risen ability once you drawn enought cards
Niv-Mizzet is Stoned
From what do you see if someone is high? From eyes, of course. And when Niv-Mizzet, the Firemind put on his Ophidian Eye you can be sure he goes like "Had I already draw?"
This one is easy. Niv-Mizzet, the Firemind enchanted by Ophidian Eye became a draw and damage, damage and draw loop. Mantain the loop 40 times and you'll have an opponent down and half library in your hand. When you draw Ophidian Eye you can give it directly to Scion then turn it into Niv-Mizzet, the Firemind
The hardest part here is to know when to stop with the loop (you just need to target a creature instead of a player to stop drawing, even Niv-Mizzet itself) and choosing what to do with the cards in your hand. This Is why I introduced the Real Dragon Feast