Eliana, Bountiful Matriarch

Flying

When this creature enters the battlefield
create {x} 0/1 Egg Creature Tokens with Prowess
and "When this creatures power becomes 5 or greater, exile this creature and return it to the battlefield as a 5/5 Brooding Bird Token with flying"
Whenever a creature you don't control dies, create a 2/2 Black Vulture Creature Token with flying