The secret medicine of the village removes wounds, pain... even fear.
Trigger:
Heal
(You may only have up to four [Heal] triggers in a deck. When revealed as a trigger, choose one of your units, and it gets [Power] +10000 until end of turn! Then, if the number of cards in your damage zone is equal to or more than your opponent's, choose a card from your damage zone, and heal it!)