Carrion Grub

The 0/5 body is the whole gambit: a wall that stocks its own graveyard the moment it lands. The mill on entry isn't self-inflicted damage here, it's fuel, because the buff reads off the single greatest power among creature cards in the yard rather than counting bodies or dumping them onto the battlefield. That's the seam worth studying. Most graveyard-matters creatures want quantity (a Golgari Grave-Troll scaling with a full bin, an aristocrats deck wanting fodder to sacrifice); this one wants one fat corpse and doesn't care how it arrived. Pitch a single large creature to the yard, whether via the mill trigger, a discard outlet, or a self-mill dig spell, and the wall becomes a beater without ever having been assembled as one. The design stays honest by keying only on power: toughness is fixed at 5, so it blocks the same whether it hits for two or for ten, and it never scales past what your graveyard actually holds. That fixed toughness is also the tension in the card, because attacking taps it out of a blocking role it was clearly built for; the same 0/5 that walls the ground can only swing at the cost of leaving that ground open. It reads as a defensive body that doubles as a payoff for a discard-and-reanimate shell, filling its own yard on the way down rather than waiting for the graveyard to be stocked first.