Reezus, Portal Mage

If you control a plains, island, and mountain, you
may reveal a White, a Blue, and a Red card from
your hand, and exile them face-down rather than paying Reezus' mana cost.
{1}{w}{u}{r}: Exile the top two cards of your library
face-down, then reveal one face-down exiled card
you own at random. You may play that card this
turn without paying its mana cost.