That's the problem with playing survival mode: you're definitely going to be forgetting and once you do your cards are locked and you can't play ranked battles even though your mana is wasting away..

I choose not to play survival because I really don't have much cards, and my Guild games are going to suffer with all that cool down stuff.

You're right, I guess there shouldn't be a rush to actually burn these cards, so I'll just watch out and see which I can max out.