Coordinated Barrage

Instant, W (1)
Choose a creature type. Coordinated Barrage deals damage to target attacking or blocking creature equal to the number of permanents you control of the chosen type.
Illus. Franz Vohwinkel

Crystal Keep Rulings Summaries

• You choose the creature type during resolution. [Morningtide FAQ 2008/01/15]
• Any spell or ability used to prevent damage would have to be played prior to resolution, which means prior to knowing which creature type will be chosen. [Morningtide FAQ 2008/01/15]

Format Legality	Legal in Vintage, Legacy, Extended, Standard
Printings (1/10)	Morningtide (Common)