Harrow, Mind Psion

Extort (Whenever you cast a spell, you may
pay {w/b}. If you do, each opponent loses 1 life, and
you gain that much life)
When you tap either a Dark Catacomb or a Luner Crypt for mana, add either {b} or {w} to your mana
pool, depending on what you tap. (In addition
to the mana that land produces)