Uim, Fetid Tyrant

Deathtouch
Whenever a creature with a -1/-1 counter on it
dies, its controller loses 2 life, then put a -1/-1
counter on target creature.
Pay 2 life: Target creature gains persist until end
of turn. (When this creature is put into a graveyard
from the battlefield, if it had no -1/-1 counters on it,
return it to the battlefield under its owner's control with
a -1/-1 counter on it.)