Which cards should I use?

Available cards (All S Rank):

Hero
Cannon Shooter
Mercedes
Dawn Warrior
Demon Slayer
Buccaneer (Planning on deleting for EunWol.)
Mechanic
Jett (Planning on deleting if it ever comes down to needing the slot.)
Paladin
Phantom
Luminous
Kaiser
Angelic Buster
Kanna
Hayato
Xenon
Demon Avenger
Thunder Breaker
Wind Archer
Archmage I/L
Beast Tamer

Currently I use:

Deck 1:

Buccaneer, Angelic Buster, Thunder Breaker

Deck 2:

Xenon, Demon Avenger, Mechanic

Deck 3 for non-Magicians:

Kaiser, Hayato, Zero (Would swap out with Paladin if I ever hit 200 on someone.)

Deck 3 for Magicians:

Luminous, Kanna, Archmage I/L

For the most part, I go for the cards with bonuses I want and pair them in decks accordingly, not really caring for the deck bonuses so much. But I'm wondering if there is a more optimal setup with what I have than what I'm currently going with.