This would be a great meta-shifting card. I love it! I agree with Anurak, though, the health should be lowered to 5. The allies that have more than 4-5 HP are able to be balanced specifically because they can be hit by burn + attack. You'll note there aren't any 6-health allies with inherent stealth abilities either.
Also, I don't like the word "Immune" for the ability. It's too vague, not particularly flavorful (what is he "immune" to? Why immune to ability damage and not attack damage? Why isn't it a vaccine against poison? ). I thought of "Warded" as a better word, I'm sure there are others too.
On the whole though, it's a great idea for a card!
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