Mana Enclave

Once per turn, if a mana source you control is
tapped for mana, you sacrifice a creature.
At the beginning of your turn, exile the top card
of your library or Mana Enclave phases out.
{t}: Add {2} and one mana of any color to your
mana pool or draw a card.
"Weird visions, odd worlds far beyond the planes..."
-Kalgec