Nkoss, Soul of War

+2: Target creature gets +X/+X and menace until end of turn, where X is the number of creatures in your opponents graveyard.
-3: Destroy all creatures your opponents control with power or toughness less than 3.
-9: You get an emblem with "Creatures you control get +X/+X and menace, where X is the number of creatures in your opponents graveyard."