Melania, Goddess of rot

Double strike, deathtouch, lifelink, flying
-Damage dealt by Melania, Goddess of rot to other creatures is turned into -1/ -1 counters.
-If Melania, Goddess of rot deals damage to a player, that player gets 3 poison counters.
-As long as Melania goddess of rot is on the battlefield, creatures you control get a -1/ -1 counter.