heren, book thief

Eminence - When ever you would draw any amount of cards instead for each card you would have drawn search your library and target opponents library for a card, exile both then flip a coin, on heads you may cast your opponents card from exile for as long as it remains exiled this way, you may use mana as if it were any color to cast this spell, on tails you take the card you own into hand, your opponent takes the card they own into hand

Spells in exile have "when this spell would enter the gravey