Reka sucks.

There's an obvious problem here. Reka, at the same cost,sac, and ability, has +10/+5. But in return she loses self-healing and she's unique. She's not even good in a robot deck, Paladin Lifegivers are much better choices to run if you want healing. Paladin Lifegivers also get Paladin synergy(which, in this case, is worse more than her hero synergy. How many hero robots are there? Spybot? I'm sure you'll be running Reka to heal a 60/20 quick hit monster. Especially if there's only two of them in your deck.)

She needs either a completely new ability, or something tacked on to her current ability. If we dropped her to 3, she'd pretty much do what Ardam does but she would suck at that. If we gave her a stat and cost increase, then she'll just be a beatstick with a bad ability. Pretty much she needs an ability change like Howard did. She's slightly different, but still. Personally, I'd be fine with her giving +10 life to the robot she heals, but I really doubt people want to see that with a card like The Creator running around.

My suggestion would be to sort of make her like a robot-only Inn.

Target robot is healed.

It's not a complete change, but it'll at least make her worth running in a robot deck.