Miku, Voice of the Wellspring

Companion — No card in your starting deck
has more than one of the same mana symbol in its mana cost. (If this card is your chosen companion, you may put it into your hand
from outside the game for {3} as a sorcery.)

Tap: Add {w}{u}{b}{r}{g}. This mana can't be spent to pay generic mana costs.