Reroll on epiphanies

Ive been farming straight for the last few days for Rin to get her summon card with the ap+1. About ready to go mad. I had it once with 3 copies but of course no equipment events for good gear or my other cards got crappy rolls. About ready to give it up. They need to implement a reroll option on these cards. Absolutely insane how dumb luck it is for a character I want to kit out.