The most recently released card with a Backlash ability was Uchtul-- and he was released almost a year ago. Does the UR community hate Backlash so much that UR has stopped making cards with that ability? If that's the case, it would make me sad-- I think if done right, Backlash allows for a new dimension of different strategic choices.
Come to think of it there are 3 ways to make a playable Backlash card:
1) Make it a Gheist or Roots with decent stats.
2) Make it break the design rules for it's clan.
3) Give it stats 2 or 3 star levels above what they should be. Norman would be played if he were a 2*, Beef would make a decent 3*, Uchtul would be played as a 4* etc.
I have a 4th way
4) Remake the stats of all none Backlash cards so they are weaker
I wish they'd do that to bring balance to this game, but that's probably never going to happen. So yeah Kefalo covers everything worth mentioning I think
Uchtul would be great as a 4*, not OP at all