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The format has enough of them that this doesn't really need a buildaround grade

Once transformed, it becomes The Core

gem dragons in general had been absent from D&D since the game's third edition, and now they're storming back onto the scene with a chapter in Fizban's Treasury and their very own WizKids miniatures (which you can pick up for a reduced $58.63 at Amazon, as it so happens)

A modal double-faced card can be transformed or be put onto the battlefield transformed

36 Dominaria United MTG Draft Boosters + 1 foil Box Topper card

To double a creature's power, that creature gets +X/+0, where X is that creature's power as Double Trouble resolves