name: Invoke Prejudice
originalText: If opponent casts a Summon spell that does not match the color of one of the creatures under your control, that spell is countered unless the caster pays an additional o\nX where X is the casting cost of the Summon spell.
printings: LEG
text: Whenever an opponent casts a creature spell that doesn't share a color with a creature you control, counter that spell unless that player pays {X}, where X is its mana value.