Tyrael, Archangel

Flying, Vigilance
When Tyrael, Archangel blocks, creatures you
control get +0/+X where X is the amount of
damage you've been dealt this turn.
When Tyrael is dealt damage, if it is lethal, he deals
X damage to the source's controller & each creature
& planeswalker they control where X is the amount
of excessive damage dealt to him.

"I am The Archangel Of Justice!"