Pure-Mana Mage

Protection from multicolored
Whenever a player casts a multicolored spell, you
may pay {x}{w}{w}. If you do, create an X/X white
Spirit Avatar creature token with flying, lifelink,
and protection from multicolored.
{1}{w}, {t}: Creatures you control with protection
from multicolored get +1/+1 until end of
turn.