Brain of Cthulhu

Flying, hexproof
Brain of Cthulhu can't be countered.
When Brain of Cthulhu enters the battlefield,
create X 0/1 colorless Creeper tokens with flying.
Brain of Cthulhu has indestructible as long as
you control a Creeper.
Whenever Brain of Cthulhu takes damage, create
a 4/1 black Brain token with flying.