Magician's Deck is a weapon for Ace. It provides 52 Attack and All Magic +20. It costs 35000 gil and sells for 3500 gil.
In the PSP version, it can be bought from the Armory by bringing Ace on missions 200 times. In the HD version, it can be bought after landing 200 Killsight strikes with Ace.
The Magician's Deck is one of Ace's unlockable weapons. It can only be obtained by purchasing it as DLC from the PlayStation Store. Like all other characters' weapons, equipping it offers no advantages or disadvantages.