Board Thread:General Discussion/@comment-182.18.249.164-20131128005052/@comment-11558199-20131128093541

you can keep those cards from events (cards with Gold banners) since they're hard to obtain again after their event, but for those cards you can get from the free summon just fuse all sell them away since they can be obtained easily (unless its Rapunzel(Summer), Sleeping Beauty(Summer) or High Elf since they're hard to come by in the free summon)

Keep Dark Elf though since she can be useful during certain events and her skill can be maxed using wind weasels (plus she's hard to get in the free summon)

But if you really really like the art of those cards, you can keep them as you please :D (I never fuse away event cards)

I don't think there's a limit for cards... I've seen people with daemon capacities of 250 or more before...

Yes Cabal Chains give 100% rate negotiation as long as you have enough chains for the specific daemon