Interesting combo with RE, allowing nothing to get through unless it ignores shields.
Not OP though. I don't know if I quite like it though.
It could force a strategy not commonly seen in the game, and it could force small creature decks to become more prevalent.
That's assuming this becomes like Dim Shield and rules the meta. It won't. It's not stronger than Dim Shield, and Dim Shield can easily be prevented with a little PC.
Although this probably outclasses Gravity Shield by a lot though.