yo lamaz game studio im still having same issue and i got suggestion: make a diamond and platinum and since its rarest mutation make that they give stat buff like % for example diamond gives 10% but the diamond full art gives 20% and the platinum gives 40% and the full art gives 80% (its just an example u can modify the percent amount of how much it buffs the stats for example if u want to make it lower u can as long u think its fine)