Lifelink

Whenever Malenia, Blade of Miquella attacks or blocks, put a -1/-1 counter on it. Then, if the number of -1/-1 counters on it is greater than or equal to its base toughness, exile it and return it to the battlefield transformed.

Flying, lifelink, infect

Whenever Malenia, Goddess of Rot attacks or blocks, put a -1/-1 counter on each creature and a poison counter on each player. Until end of turn, Malenia, Goddess of Rot gets +2/+2 for each -1/-1 counter on it.