Yahenni, Undying Partisan (Secrets of Strixhaven Commander #232)

Legendary Creature — Aetherborn Vampire - {2}{B}
Haste
Whenever a creature an opponent controls dies, put a +1/+1 counter on Yahenni.
Sacrifice another creature: Yahenni gains indestructible until end of turn.
2/2
„"The time for subtlety is over, darling."“