i'm afraid this would count as a game modification under rule 10, and thus be banned; editing your save to disable it would also be banned under rule 9. here's a legitimately-obtained save file with the centaur card not unlocked: Antler Max Save (Without Centaur). your best bet is to use steam's Verify Game Files option to reset all changes to your game's scripts, then use this instead of your own savefile.