Heretic

Mutate {4}{p/b}{p/u}: Heretic mutates as normal,
except you must place it on top.
Whenever Heretic mutates, put a Ruin counter
on up to three target creatures.
{u/b}{p/u}: Heretic phases out
{u/b}{u/b}{t}: Destroy target creature that was dealt
damage by Heretic this turn.
{u/b}{u/b}{p/b}: Creatures with Ruin counters get -2/-4
until end of turn.