Cinderbones

Wither is what turns this regenerating skeleton from a recycling chump into a piece of attritional sandpaper. Every point of combat damage it deals to a creature lands as a permanent -1/-1 counter, so its job isn't to chip at life totals but to dismantle the board one block at a time. Trade it into a 3/3 and the 3/3 walks away a 2/2; do it again and it shrinks to a 1/1, and so on until it falls apart. Regeneration keeps the loop running, absorbing combat that would kill the body and bringing it back next turn to grind the same attacker down further. The friction is that all of this only happens in the red zone. Wither does nothing to a player or a planeswalker; an unblocked swing is just one damage, no counter to show for it. The card wants to block or be blocked, where its damage converts into lasting subtraction rather than a clock. That makes it slow, mean board control: a creature whose value is measured in how much enemy toughness it has permanently erased, not in how fast it closes the game. Black skeletons regenerating in combat is old design language, the indestructible chump that refuses to trade. Layering damage-as-counters on top of that quietly rewrites the archetype's purpose, from surviving exchanges to making every exchange a net loss for the opponent's battlefield.