Spectral Grotto

Spectral Grotto enters the battlefield tapped.
{t}: Add {c} to your mana pool
Moonlight - If Moonlight is in effect, Spectral Grotto has "{t}: Add one mana of any color to your mana pool and Spectral Grove doesn't untap during your next untap step."
Eclipse - If Eclipse is in effect, you gain life equal to the amount of untapped lands you control during your end step.