Instant and sorcery spells costless to cast.
5/1/2012 Arcane Melee can’t reduce the colored mana requirement of an instant or sorcery spell.
5/1/2012 If there are additional costs to cast a spell, such as a kicker cost or a cost imposed by another effect (such as Thalia, Guardian of Thraben’s ability), apply those increases before applying cost reductions.
5/1/2012 Arcane Melee can reduce alternative costs such as miracle costs.
5/1/2012 The cost to cast an instant or sorcery spell with one generic mana in its mana cost will be reduced by . For example, an instant spell with a mana cost of would cost to cast.