Ensnared by the Mara

Each opponent faces a villainous choice — They
exile cards from the top of their library until they
exile a nonland card, then you may cast that card
without paying its mana cost, or that player exiles
the top four cards of their library and Ensnared
by the Mara deals damage equal to the total mana
value of those exiled cards to that player.
Some people choose to live inside the wasteland created
by Rionya. The danger is their protection.