Tested on version 8.2.3, Gambling is capable of raising intelligence 70, i haven't been able to get it to proc past 70.
It's an EXTREMELY low rate where i gained roughly 80 points of gambling when i finished getting just 10 points of intelligence, this rate will be further decreased if will is mixed in, it's easy to max out will before grinding this if your a max level atheist.
My advice for farming int with this method is save in the dockgrave tavern, enter the gambling and immediately fold.
It's an EXTREMELY low rate where i gained roughly 80 points of gambling when i finished getting just 10 points of intelligence, this rate will be further decreased if will is mixed in, it's easy to max out will before grinding this if your a max level atheist.
My advice for farming int with this method is save in the dockgrave tavern, enter the gambling and immediately fold.