Magic+

Magic+, also known as MAG+, is an ability in the Final Fantasy series that increases the user's Magic stat. It variously increases Magic by a specific amount, or by a percentage of the character's base Magic. At times abilities that boost magic effectiveness have their effects stats by boosting the power of spells instead of basing their benefits on the Magic stat.

Final Fantasy IV
Palom's Bluff ability increases his Intelligence, boosting the damage his magic does. In the Nintendo DS release Bluff doubles Intelligence but wears off after the user casts a spell. It can be taught to any character as an Augment.

Final Fantasy VI
Some Espers grant an increase to Magic when a character equipped with their Magicite levels up. Cait Sith and Maduin grants +1 Magic, while Zona Seeker and Valigarmanda grant +2 Magic.

Final Fantasy VII
The Magic Plus Materia increases magic by 10% at level one and grows stronger as it levels up, growing to a 50% boost at level five.

Crisis Core -Final Fantasy VII-
Materia can be granted boosts to Zacks MAG stat, up to a maximum of +100 MAG on a single Materia. The Support Materia SP Turbo and SP Turbo Magic increase the power of Zack's Magic Materia by 20% for each level of the Materia, but Zack will lose SP when casting magic.

Final Fantasy VIII
Mag +20%, Mag +40% and Mag +60% can be learned by Guardian Forces. The Mag Bonus ability grants a character a permanent increase to their Magic by 1 when they level up. GFs can also learn SumMag +10%, SumMag +20%, SumMag +30% and SumMag +40%, each level increasing the damage done by the GF when it is summoned into battle.

Final Fantasy IX
Dagger and Eiko can learn Concentrate, which increases the power of their magic.

Final Fantasy X
Magic +3%, Magic +5%, Magic +10%, and Magic +20% can be customized onto weapons.

Final Fantasy XII
The Magic Lore Augment increases Magick Power by 1 when taken. Spellbreaker doubles the power of offensive spells, powers up curative spells by 50%, and doubles the chances of status spells taking effect, but only when the character is in critical HP. Serenity powers up offensive spells by 20%, curative spells by 50%, and doubles the chances of status spells working, while the character is at full HP.

Final Fantasy Tactics
Black Mages can learn the Arcane Strength ability, boosting the power of their spells. Bards can learn Magick Boost, increasing their Magickal Attack by 1 when they are hit with a weapon.

Dissidia Final Fantasy / Dissidia 012 Final Fantasy
Various accessories and weapons grant boosts to Damage and Magic Damage by set percentages, as in this game there is no Magic stat and the power of all attacks is govered by the ATK stat.