Knoron, Titan of Ends

Indestructible
As long as your devotion to Colorless is less than
5, Knoron isn't a creature. (Each {c} in the mana costs of permanents you control counts toward your devotion to Colorless.)
Creatures you control have "Exile this creature: Add {c}{c}{c}." and "Whenever this creature deals lethal damage to its blockers, exile them."