The Abyss

{t}: Discard a card, The Abyss deals 1 damage
to you.
Whenever you would tap a land for mana, if
there are no cards in your hand, add {b} to your
mana pool (In addition to the mana the land
produces.)
"Know that when you gaze long into the abyss.
The abyss gazes also into you."