Common Courtesy

Enchantment, 2UU (4)
Counter any spell unless its caster asks your permission to play that spell. If you refuse permission, Sacrifice Common Courtesy and counter the spell.
"You didn't say the Magic word."
Illus. Mike Raabe

Format Legality	Banned in Vintage, Legacy, Extended, Standard
Printings (1/1)	Unglued (Uncommon)