He Who Devours Worlds

Hexproof, Indestructible, Lifelink.
You may sacrifice any number of creatures, when you cast this spell. Each sacrificed creature pays for {1}.
When He Who Devours Worlds enters the battlefield, Give all Nothings +1/+1.
{b}{b}{t}: Destroy target non-Nothing creature. When He Who Devours Worlds dies, each opponent discards a card.