Amatess, God-Avatar of Sparks

Defender, First Strike, Double Strike
Creature and Planeswalker spells you cast can be cast using any combination of any mana of any color.
When a Nonland Permanent is cast under your control, you may gain I mana for each of the spells colors.

Pay{w}{w}{u}{u}{b}{b}{r}{r}{g}{g}: Amatess, God-Avatar loses Defender and gets +X/+X, where X is the number of multicolor creatures you control.