Shurwa, Heir to Desolation

Wither
At the beginning of your upkeep, you may exile
the top card of your library face down then, you
may sacrifice Shurwa, Heir to Devastation. If you
do, reveal all of the cards exiled with Shurwa.
Target opponent separates those cards into two
piles. You may put one of the piles into your
hand, and exile the other face down.