Duskmantle Surgeon

Hideaway (When this creature enters the battlefield,
look at the top four cards of your library, exile one face
down, and put the rest on the bottom of your library.)
At the beginning of your upkeep, you may pay {b} and turn the exiled card face up. When you
do, target opponent reveals their hand. You
choose a nonland card from it that shares a card
type with the exiled card. That player discards
that card.