Conclave Arcana packs bought:
Starter: 0
Standard: 7
Alchemy: 2
Legendary:

All these costs 100k DEC? WOW I know it's DEC, but how much is that in dollar?
However I think since you've qualified to get the promo card rewards, you can as well sell off later and make back your money, but I know the plan is to open the pack. Congratulations to you.