Fire Keeper

•Vigilance
•{t}{2} Sacrifice a creature of power 2 or more,
as long as Fire Keeper remains on the battlefield,
Fire Keeper gains, "Any life this creature's controller gains is that much +1" (stackable)
•When Fire Keeper exits the battlefield,
controller can no longer gain life through
sorceries or instants until Fire Keeper re-enters
the battlefield.