Widespread Thieving

Hideaway 5 (When this permanent enters the battlefield, 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
{w}{u}{b}{r}{g}. If you do, you may play the
exiled card without paying its mana cost.