... Bother making a Xenon?

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.

Due to this, I decided that sets in general are pretty useless and I should just do the Warrior set and 2 sets of randoms.

Aran/DrK/Hayato

Mechanic/Mercedes/DA

DS/Kanna/(?)

That last slot could be taken up by a lot of things. Thunder Breaker and Kaiser are two options, as well as a POSSIBLE Marksman (note that I despise archers), or even Battle Mage. So many options for that last slot.