5Ds Tag Force 4 (Japanese Name: 4 Yu-Gi-Oh 5Ds Tag Force 4) Yu-Gi-Oh
The idea is to summon one of the Kaijus with lower ATK, like Gameciel, the Sea Turtle Kaiju and Gadarla, the Mystery Dust Kaiju to the opponent's side of the field, and the player has the option to summon one of their own with higher ATK such as Jizukiru, the Star Destroying Kaiju
(It's worth nothing that the list doesn't need to be 40 cards long - that's just a coincidence.) For more Magic: The Gathering news I recommend checking out the MTG release schedule
In gameplay terms, Vault 112 seems like a pretty decent energy producer that slows your opponents down, then becomes a powerful effect to spend your energy on, providing a free card which you can dig deeper for if you plug in some volts
And then when more variants came out, we just didnt question it because it came from a reputable source. To him, the idea that they might be phony violated Occams razor: These had been announced by Akabane