Infighting

Target one or more attacking creatures with power X or less and remove them from combat. You may assign them as blockers until end of turn. This spell costs {x} more to cast for each target beyond the first. Exile this spell as it resolves.

You may cast this spell from exile by exiling a red spell from your hand where X is that spells mana value. You may cast instants and sorceries exiled this way until the beginning of your next end step.