Ossuary Rats
The trigger and the body want opposite things, and that tension is the whole knot. The entering-damage effect scales off dead creatures in your graveyard, which means it only threatens something worth killing once the game has run long enough to fill the bin. But a 3/2 for six is a rate you would have wanted four turns earlier, not on the turn its graveyard finally holds enough fuel to matter. By the time X is large, the fragile body attached to it rarely swings a board it arrives late to, and the damage still only aims at what an opponent controls. Recursion is the natural pressure-relief valve: a creature you can return and recast fires the ping again and again, turning a one-shot into a repeatable removal engine. Nothing on the card builds that loop, though, so it leans entirely on a graveyard-matters black shell where the creature count is already high for reasons unrelated to this Rat. Inside that context it is a modest value piece that occasionally shoots something dead. Outside it, an overcosted body bolted to a conditional burn spell, content to fill a role rather than define one.
