Fifth Edition

Prismatic Ward

When you play Prismatic Ward, choose a color.
All damage dealt to enchanted creature by sources of the chosen color is reduced to 0.

Enchant creature
As Prismatic Ward 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

Ice Age

When Prismatic Ward comes into play, choose a color; all damage dealt to target creature by sources of that color is reduced to 0.