Whenever you cast your first spell during each opponent's turn, look at the top card of that player's library, then exile it face down. You may play that card for as long as it remains exiled, and mana of any type can be spent to cast it.
Near Mint - $4,700
Lightly Played - $3,700
Moderately Played - $3,300
Heavily Played - $2,800
Damaged - $2,400
Near Mint Spanish - $4,700
Lightly Played Spanish - $3,700
Moderately Played Spanish - $3,300
Heavily Played Spanish - $2,800
Damaged Spanish - $2,400