Malenia, Goddess of Rot

Flying, double strike, lifelink, wither (This deals
damage to creatures in the form of -1/-1 counters.)

Scarlet Aeonia - When this creature transforms
into Malenia, Goddess of Rot, each opponent
gets a poison counter. Then put a -1/-1 counter
on each creature your opponents control for
each poison counter its controller has.
When Malenia, Goddess of Rot deals combat
damage to a player, proliferate