Mag, the Quakebringer

Your opponents can't gain life.
At the beginning of your upkeep, Mag, the
Quakebringer deals 2 damage to each opponent.
This ability triggers only if Mag, the
Quakebringer is on the battlefield or if it is in
your graveyard and you control a Giant.
"Let Maester Luwin ride beyond the Wall. He'll find
giants then, or they'll find him." - Bran