The Messenger of Evil Plans

When The Messenger of Evil Plans enters the battlefield, exile the top seven cards of your library
face down.
Whenever a creature an opponent controls dies,
clash with that opponent. The Winner may return
that card to the battlefield tapped, under its owners
control. If a player does, you may cast one of the
exiled cards without paying its mana cost. Then, if
no cards remain exiled with The Messenger of Evil
Plans, you win the game.