Enchiridion

Multicolor spells you cast cost {1} less to cast
and can't be countered.
{t}, {w}{u}{b}{r}{g}, Exile Enchiridion: Shuffle your
library, then exile the top three cards of your
library. This turn you may cast those cards
without paying their mana costs. Activate this
ability only if you control a permanent of each
color.