2012-05-01 : Arcane Melee can reduce alternative costs such as miracle costs.

2012-05-01 : Arcane Melee can’t reduce the colored mana requirement of an instant or sorcery spell.

2012-05-01 : 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.

2012-05-01 : The cost to cast an instant or sorcery spell with one generic mana in its mana cost will be reduced by {1}. For example, an instant spell with a mana cost of {1}{G} would cost {G} to cast.