Sea of Lava

This land enters the battlefield tapped unless you control a swamp or mountain.
{t}: Add {r} or {b}
Whenever you cast a creature spell, you may pay
2 life. If you do, it enters with a +1+1 counter
and haste.
Sacrafice a creature: It deals damage equal to its
power to any target.
Sacrafice a land: Add {b}{b}{b}{b} or {r}{r}{r}{r}
Pay X life: return target creature with converted
mana cost X to your hand.