User blog comment:Choocolatiah/Minimising Gem Expenditures/@comment-30299451-20190212170209/@comment-26039274-20190212233032

- have no idea on how to max its attack
 * uhh.. maxing stats are like the usual card upgrading, except you use only one fodder card per upgrade and use atk/def arcana instead of the green/gray ones

-is there a specific way to do it so that it has max attack while minimizing gem cost
 * no, there's no other way to minimise gem cost while maxing stats. You have to do it while it is still at low levels.

- how do I calculate the stat cap for attack
 * you don't, it's game provided. The stat cap for GLR is 150k
 * if you meant to ask the max amount of arcana needed to max atk, this sheet may help.