The Abyss

The Abyss enters the battlefield tapped.
Whenever it untaps, you lose 1 life.
{t}: Add 1 mana of any color.
Exile target Human you control, {t}: Look at the
top card of your library. If it is an artifact, put it
on the battlefield and return the exiled Human
to the battlefield. If it is a non-Human creature
card, put it in your hand. If it is anything else,
you may put that card on the top or bottom of
your library.