Kagadu, Essence of the Swamp

Indestructible, deathtouch
If your devotion to black is less than eight then Kagadu, Essence of the Swamp can't attack or block.
Landfall - Whenever a land enters the battlefield under your control if it's a swamp you may sacrifice a creature. If you do destroy target creature with converted mana cost equal to or less than the sacrificed creatures's.