Likeness Looter

Most Shapeshifters copy a creature and stop there; this one is built as a two-stage engine, where the looting body sets up the graveyard the copy ability then reaches into. The tap ability fills your bin with exactly the creatures you want to become, and the clause pulls one of them back on, always keeping flying and the ability itself so the transformation is never a dead end. The mana value tax is the balancing act: to wear something big you pay X equal to its cost, which makes the shape-change a scaling investment that grows only as fast as your mana does, not a reanimation shortcut. The sorcery-speed restriction on the copy matters too, keeping the Looter from ambushing at instant speed and forcing the shape-change onto your own turn, on your own priorities. And because copying a card in the graveyard doesn't consume it, the loop stays live: the clause turns the Looter into that creature rather than moving cards around, so you can shift shapes turn after turn as the board asks for a blocker, a body, or a threat. Blue-black self-mill engines usually dig toward a single payoff; this one is both the digger and the payoff, a 1/1 flier that becomes whatever the graveyard has already earned.