Anaziel, Radiant Defender

Vigilance, lifelink
{t} When a creature you control takes damage
from an opponent's creature, you may tap
Anaziel, Radiant Defender and prevent that
damage. If damage is prevented this way. Anaziel, Radiant Defender deals that much damage to a creature under that opponent's control.
"I will defend you as long as I still draw breath."