Metamorphosis Rune

Rune (As you cast this spell you may exile it. As long as this spell remains in exile you may play a copy of it once per turn without paying it's mana cost. If you exile another spell with Rune move Metamorphosis Rune to your graveyard.)
Untap target creature or gain 2 Life.
A twisted cross etched in your mind. Used by the hunters to allow them to fight long into the night.