Keeper of the Gates

Outlast {1}{r}
Spells your opponents control that target a
creature you control with a +1/+1 counter on it
cost {3} more to cast.
Whenever you, a planeswalker you control, or a
creature you control would take damage, you may remove any number of +1/+1 counters from
Keeper of the Gates. If you do, reduce the
damage dealt by that much.