Zanko, Lord of Bats

Vigilance
Flying
When Zanko, Lord of Bats, enters the battlefield, you may put X swamps into your graveyard and then create X 2/1 bats with lifelink and flying.
If Zanko, Lord of Bats dies, you can sacrifice 3 bats to take him out of your graveyard and play him onto the battlefield tapped.