Prismatic Ward

Enchantment — Aura • Mana cost: {1}{W} • Ice Age • Common

Enchant creature
As this Aura enters, choose a color.
Prevent all damage that would be dealt to enchanted creature by sources of the chosen color.

"These, of all spells, must have common components I can isolate and use."
—Halvor Arensson, Kjeldoran Priest

Illustrated by Allen Williams.