Power from Pain

Sadism(Whenever a creature you don't own takes
damage and is not destroyed, trigger the following
effect.),Creatures you control get +0/+1 until end
turn. If this is the 6th time this ability has
triggered this turn, then each opponent loses 6
life and you gain 6 life.
We are swift, and we are lethal. We are a poisoned
dagger thrust into the heart of the foe. We are the
hidden blade, the strike so sudden that the enemy falls before they ever know they are under attack.