Yahenni, Undying Partisan

Yahenni, Undying Partisan

Legendary Creature - Aetherborn Vampire | Power/Toughness: 2 / 2 (CMC 3)
Haste
Whenever a creature an opponent controls dies, put a +1/+1 counter on Yahenni, Undying Partisan.
Sacrifice another creature: Yahenni gains indestructible until end of turn.