Natheil, Ætherborn Druid

Vigilance, Ward-{2}, Deathtouch
{x}, {t}: Exile target card in a graveyard where X
is equal to the mana value. Gain {e} equal to X.
Pay any amount of {e}, {t}: Add x mana in any combination equal to the energy payed this way.
{2}{u}: Untap Natheil, Ætherborn Druid.
Once per turn.