Carrionette

A removal spell disguised as a body, and the disguise is the whole point. The 1/1 on the front is bait: you trade it in combat, chump it, or sacrifice it, and only once it reaches the graveyard does the real card switch on. From there it spends itself to exile a creature unless its controller coughs up two mana, a tax that reads cheap but adds up against the tempo of having already gotten value from the front side. The design discipline is the location restriction: the ability fires only from the graveyard, so the card cannot sit on the battlefield as repeatable removal the way a tap-down or a sacrifice-outlet creature might. Since exiling it is part of the effect rather than the cost, it normally resolves as a single answer, and it costs real mana () on top of having lost the creature first to earn it. That two-stage structure (a worthless body that becomes a one-shot answer once it dies) is a small but durable engine in a deck built to feed graveyards on purpose, where a two-drop that dies and then erases an opposing threat is two cards' worth of work from one slot. The forced exile (not a sacrifice, not a -X/-X) is what gives it teeth against recursion and indestructibility; the controller's option to pay is what keeps it from being a hard, unconditional answer. Skeletons in this era leaned on regeneration to be sticky; this one inverts the idea entirely, asking to die so it can do its job.