Unhallows Bone Temple

This land enters the battlefield tapped.
{t}: Add {w} or {b}.
{x}, {t}, Sacrifice Unhallows Bone Temple: Add X
mana in any combination of colors to your mana
pool. Create a black 1/1 Zombie creature token
with "While this creature is black, it has "{t}:
Return Unhallows Bone Temple from your
graveyard to your hand. This creature becomes
white and loses other .. colors. You lose 2 life."