Grimgrin, Corpse-Born
The drawback is the engine. Entering tapped and never untapping on its own would be dead weight on most bodies, but here it is the pivot the whole card turns on: the only way to ready a 5/5 that grows is to feed it another creature, and every creature fed makes it permanently bigger. The two abilities lock together into a self-fueling loop where bodies become both untap fuel and a stream of +1/+1 counters, so a Zombie commander surrounded by expendable creatures effectively converts its own battlefield into combat readiness and size on demand. The attack trigger then closes the deal: it destroys a target creature the defending player controls and stacks yet another counter, meaning an unblocked swing is rarely a fair fight and a blocked one rarely survives. The durable part of the design is that the sacrifice ability is instant-speed and uncapped, so the card answers removal, ambushes blockers, and resets its own tapped state all through the same input. That flexibility comes tethered to a dependence: starved of fodder, it sits tapped and inert, a 5/5 that cannot block and will not swing. That tension between a body that wants to be enormous and a battlefield it constantly eats defines the card, asking you to treat your own creatures as ammunition.
