流(りゅう)城(じょう)の密(みっ)教(きょう)信(しん)者(じゃ)

Trample

Whenever this creature deals combat damage to a player, exile the top card of your library. Until end of turn, you may play that card.

Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)