Mass Polymorph [Magic 2011]

$1.00
Type: MTG Single
Title
Set: Magic 2011
Type: Sorcery
Rarity: Rare
Cost: {5}{U}
Exile all creatures you control, then reveal cards from the top of your library until you reveal that many creature cards. Put all creature cards revealed this way onto the battlefield, then shuffle the rest of the revealed cards into your library.