Duel of the Planeswalkers

Whenever you cast Duel of the Planeswalkers,
Destroy everything, each player searches their
hand, graveyard and outside of the game for a
planeswalker card and places it onto the
battlefield. Each player shuffles their graveyard
into their library and draws seven cards face
down. During each players turn, they flip
over one card, if they can play that card they do
so without paying its mana cost. If they can not
play the card, exile it. Whenever a player has no planeswalkers left on the battl