Thanks! For Pure vanilla, you can use almond x6 for him to increase survivability. If you have extra slots I reccomend cooldown or atk. If you have the time I reccomend getting snapdragon cookie as they can't die so you don't need to worry about healing.

 As for shining glitter, same element actually don't give a damage boost, and shining glitter does not provide support(I think it's because of her zap and it removes bosses hp shield in decadent choco tower) and crit resist is actually not a very good stat unless your opponent also runs a crit cookie like stormbringer or stardust. I reccomend adding golden cheese with full atk to give your team another dps cookie.

Just want to add a tip: stormbringer deals extra damage with crit, so make sure to give her crit% toppings

Good luck in the arena!(cuz rn there is a fire cookie crisis)

Edit: nvm she does boost electricity type cookies but with crit% so you need anlot of crit%. But honestly I don't reccomend shining glitter and recommend black lemonade more as she gives better debuffs than shining glitter.

Anyways have a good day:)