Jegantha's Shadow, the Source

Eminence- At the beginning of the game, if Jegantha's
Shadow, the Source is in the command zone, search your
library for x times x cards with more than one of the same
color in their cost (Example, {w}{w}) and exile them, where
x is the amount of players.

You may cast spells from exile, and may spend mana as
though it were mana of any color to cast those spells. Each
spell you cast this way costs 1 more to cast.

Partner with Jegantha, the Wellspring.