Malenia, Blade of Miquella

Double strike, lifelink
Persist (When this creature dies, 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.)
As long Malenia has a -1/-1 counter on it, it has
wither. (This deals damage to creatures in the form
of -1/-1 counters.)
You will witness true horror. Now, rot!