Proteus, Lightrealm Guardian

The first White and Blue spell you cast each turn costs {w}{u}less to cast. The same goes for every two color combination. (Ex. red and green costs {r}{g} less).

At the end of your turn choose a color at random. Proteus deals 20 damage to all creatures of that color.

{t}{x}{w}{u}{r}{g}: X creatures become one non black color of your choice until the start of the next turn.