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Destroy it during the End Phase

All the Zekroms are in the Black Bolt set and the Reshirams can be found in White Flare

There are many uses for a Quick face-down in this game

it gains ATK equal to the original ATK of the Tributed monster, until the end of this turn (even if this card leaves the field)

That makes it significantly better than it looks, since there'll never be a situation where you're forced to sacrifice it against your will

If you're casting a modal double-faced card with escape, you choose how you wish to cast it, then pay the appropriate cost (for the face you're casting) plus exiling three other cards