Widespread Thieving (130p) - Planeswalker Stamped

Hideaway 5 (When this enchantment enters, look at the top five cards of your library, exile one face down, then put the rest on the bottom in a random order.)
Whenever you cast a multicolored spell, create a Treasure token. Then you may pay . If you do, you may play the exiled card without paying its mana cost.