GF learns Card ability.
Gambler Spirit is an item that teaches any GF the ability Card. It can be obtained by refining 5 Shumi Tribe cards into 1 Gambler Spirit, and 1 Gambler Spirit can be refined into 10 Wizard Stones via Tool-RF.
There seems to be some use for this...
Gambler's Spirit is an item that, when 20 are used in customizing a weapon, will grant the ability SOS Overdrive. It can be stolen from Catastrophe, Earth Eater, Greater Sphere, Neslug, Omega Weapon, Shinryu, Th'uban, and Ultima Buster, dropped from Ornitholestes, or bribed Floating Death.
Gambler's Spirit is an item that can be only be used in Quest Medleys. It changes the song for the next stage the player can reach to another random selection. It can be obtained randomly after completing a Music Stage.