Arcane Melee
Enchantment
Instant and sorcery spells cost 
less to cast.
Debates between wizards are never purely academic.
Jaime Jones
Commander 2013 (C13)
• #29Rulings
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.
(wotc • 2012-05-01)
Arcane Melee can reduce alternative costs such as miracle costs.
(wotc • 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.
(wotc • 2012-05-01)
Arcane Melee can’t reduce the colored mana requirement of an instant or sorcery spell.
(wotc • 2012-05-01)
Rulings
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.
(wotc • 2012-05-01)
Arcane Melee can reduce alternative costs such as miracle costs.
(wotc • 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.
(wotc • 2012-05-01)
Arcane Melee can’t reduce the colored mana requirement of an instant or sorcery spell.
(wotc • 2012-05-01)