With the release of Zahal Commander, I think the DKs might finally have a chance to play more competitively. I'm not familiar with a DK list, but I'll try my best:

Zahal Commander
Absalon
Kounok the Prophet

3x dreist
3x Chimera
3x In the name of the dragon
3x Crystal Dragon
3x Cut and Thrust!
3x Knight's Honour

Is there anything else that helps out DKs? I can't remember; I never face them...

Ardrakar or Absalon are more often chosen characters.
Chimera is Unique, so yiou can't add more than one.
Try Adding The Dragon's Champion or Magic Attack instead. If you have enough money for 3 Chimeras, Why not add some The Last Action as well.

Dreist and Chimera are unique.

Zahal Commander
Ardrakar the Dragon Knight
Absalon

Dreist
Chimera
Admiration 3
Cut and Thrust 2
In the Name of the Dragon 3
Magic Attack 2
Relic-Carrier (Epic win against Lightning Trolls)
Shape of a Dragon 3
Crystal Dragon
The Dragon's Champion 2
The Best Defense...

This is what Im currently using, and while its not perfect, its winning alot on points. If you want to focus solely on Zahal Commander, you can try stuff like Breakfest of Champions, or if you want more control, you can try Watcher to recycle your Relic-Carrier, and Distort Destiny with Relic Carrier to remove whatever your discarding from Relic-Carrier.