My favorite card is Kerozinn Cr.
I love the 5 star art and he's a great card anyway :)
The one that i've got is Ongh or Kalindra but i love Robb Cr
As for my answer, it's probably Ahkab. Great ability, great art and he fits so darn well in his clan.
Level 4 Clara art from the old cards...
Ghumbo from the newer cards
Glosh always loved him