Eternal Guardian

Flying, Defender
Landborn (Island, Mountain)(Whenever an
Island or Mountain enters the battlefield under your
control, return Eternal Guardian graveyard to your
hand.)
When you play an Island or Mountain, Eternal
Guardian loses Defender until the end of turn.
"It is a being woven of lunar power manifested in the
invigoration ot stone. Slaying it is pointless. The light
of the full moon on bare rock, and bare rock,
will cause it's rebirth."