This would be good with flying wepons and otys
Oty wouldn't be able to do anything with this, currently. Flying Weapon would immediately trigger the effect, meaning it would never be a creature.
you reflected my opinion pretty well, since I am also concerned whether light is a suitable element here, since direct damage or cards with negative effects for the owner don't fit the mechanic of light. For now, I would recommend darkness for this, since it has some sort of "reversed steal" integrated.
There are other mechanics that are spread through different elements, and there's really no reason that, if it fits thematically, shouldn't cross over. For instance. direct damage already exists in Fire, Darkness, Water, & Air. In addition, there are currently active ideas that do direct damage in both Entropy and Death that I can think of just off the top of my head. Plus, Light is kind of lacking on how it can hurt the opponent. Right now, all it can do is heal and do a bit of creature damage. No poison, no direct damage, no hard or soft CC (with the possible exception of Holy Flash), no hard or soft PC, no quanta denial...if one accepts the notion that Light can only heal, defend, and use creatures, then they will continue to be behind in balance compared to the other elements. I'd like to see other winning Light strategies than RoL/Hope.