User blog comment:Mikedinh1996/Team to beat Karl/@comment-24299339-20141019050009

Basically the easiest way to defeat Karl is with a thunder team. My teams sucked at that point of time but they were as follows:

5* Logan (lead), 6* Elimo, 5* Gilnea, 5* Dilma, 4* Lodin (Grah lead)

6* Ronel (lead), 6* Emilia, 6* Eze, 5* Rashil, 4* Duel GX (Eze lead)

Basically I used 0 items for the first squad and the main goal was to kill karls first form (Brave Knight Karl) and do as much damage as possible to his second form (Ice Warrior Karl). As said below, you can get OTKO (one turn kill) by Karl at 50% so I used Emilia's BB and guarded the rest. After that It's relatively easy and just hope he doesn't use the OTKO again

I recommend

Logan (lead), Douglas, Selena, Lilith, Kikuri (preferably another five lights lead)

Gemini (lead), Tesla, Amy, Eze, Anima May 3* (Rina with 65% atk [recommend her] or Eze with 50% atk 10% health)

You could probably hope for more thunder units, but I think with tesla you should be quite ok