Karsh, Mirrodin's Last Breath

Fateful Hour - As long as you have 10 or less life, artifact creatures you control get +5/+5 and gain vigilance, flying, first strike, trample, and indestructible.
Pay 2 life, sacrifice a nontoken artifact: Destroy target creature with power equal to or less than the sacrificed artifact's converted mana cost.
You can't gain life if Karsh is on the battlefield, in a graveyard, or in the command zone.
Mirrodin drew its last breath, and exhaled.