Cornered Market

As an additional cost to cast Cornered Market, exile a nonland card from your hand.
Target opponent reveals his or her hand. You
may choose a nonland card from it. That player exiles that card. Until end of turn, you may cast that card from exile without paying its mana cost. If you do, that card's owner may cast the card exiled to pay the cost of Cornered Market without paying its mana cost.