Five Regions' Heart

The first spell each player casts each turn has cascade. (Exile cards from the top of your library until you exile a nonland card that costs less. You
may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)
{c}: Exile cards from the top of your library until you exile a nonland card. You may cast that card without paying its mana cost. Put the exiled cards on the bottom in a random order.