Heal

From Archon Arcana

If an ability “heals” a creature, remove the specified amount of damage from the creature. If an ability “fully heals” a creature, remove all damage from the creature.

Any creature can be chosen to be healed by a card effect that heals, even if it does not have any damage on it. However, if no damage is removed from the creature, it is not considered to have been “healed” for the purpose of card effects that reference healing.

Official rules v1.7 December 2020