Guide to Feldorr

Flying, bargain 1 (You may choose to pay {1} less
to cast this spell as you cast it. If you do, it enters
the battlefield with a -1/-1 counter on it)
When Guide to Feldorr enters the battlefield,
you may look at the top three cards of your
library. If you do, you may reveal a black creature
card from among them and put that card on top
of your library, and the rest on the bottom of
your library in any order.