Dark Thicket

{t}, Pay 1 life, Sacrifice Dark Thicket: Search
your library for a Swamp or Forest card, put
it onto the battlefield, then shuffle.

A pair of blank, white, shining eyes were
growing larger through the gloom and a moment
later the dragonish face, neck, and then skeletal
body of a great, black, winged horse emerged
from the darkness.