Merchants' Frenzy

All players exile all non-land permanents they control into face up piles. Any player may cast any card exiled this way by paying it's converted mana cost. (Any colors will work.) Players can only cast any of these spells at appropriate times. (Artifacts, creatures, enchantments, may only be cast whenever the player may cast a sorcery, unless the card has Flash.)
Token creatures exiled this way cost {3} the cast.
Emblems exiled this way cost {4} to cast.