Koku, the Black-Winged King

Indestructible, flying, lifelink, deathtouch
Assimilation- Whenever a creature dies or gets exiled by Koku, the Black-Winged King, choose one of that creature's abilities that isn't a mana ability. Koku gains that ability.
{1}{w}{w}: Exile target creature that dealt damage to you. Koku becomes a 3/3 white human with shroud until your next upkeep.