... Bother making a Xenon?

Honestly, now that I know that Allied servers can give cards to mine, slots are no issue. That's why I'm okay with making a TB and Mech.

As for Pirate set being useless, I would keep it only for submains. I could make a thief set, if Thief cards were useful. What would you suggest I switch it for to use on DA?

The reason i suggest thief card set is because level s thief card set is 3% maximum critical damage. As Da dont get much in the way of Crit damage multiplier it would help. The only useful Thief card atm is Xenon tbh, and maybe db, with its % avoid is alot better than speed/jump.With that being said NW would be useful as well since it is also % avoid. As the only other way to get maximum critical damage is to have decent se gloves/nebs and the only way to get minimum critical damage is through an adventurer critical ring :/. I suggest you change the mercedes card for the Kanna card, because it does give 3% boss damage, that will stack with your DA cards, because they are different cards. Although the -5 seconds on bind can prove to be very useful, i dont see a way for you to keep it if you have the kanna card, unless you opt not to go for thief/pirate set which you stated you wanted. TBH the thief set wont be that helpful in the way because most thief cards suck besides xenon. So insted rather use other cards that can make up for not having a set like mercedes/mm card.