Divine Being -- This unit has immortal/purified. Whenever a friendly Angel within 5 spaces is destroyed, this champion gains +2dmg. When this procs 3 times, it also gains +1 defence and shielded and the ability is removed.
Angels are expensive enough with everything having flying. I would rather just build through abilities that proc off race then a full blown racial.
I assumed that if they do become a thing there would be a release of a wide variety of Angels -- both cheap and expensive. Besides, you can stick the ability in one of the upgrade lines which would probably make 'em cheaper in most cases.