Seems OP. Not only does it block a high amount of damage, but it also has the chance of attacking on the opponent's turn. That seems a little excessive to me. In addition to the fact that Light already has 3 shields.
Can you please ignore the fact that Light already has 3 shields? This series is meant to have 1 rare shield for each element, and I don't think Solar, Mirror, or Hope are really worth being rares ATM (Hope is best off being really expensive but no further than that).
2 DR technically isn't "High" - avoiding all damage is (Phase, Dusk, and Fog) or blocking a load of damage is (Hope, Titanium, Permafrost). Thematically it's a little off - how exactly do blinded creatures attack their owner? (Then again I really like the mechanic as well - we currently don't have a card that focuses on repeling damage this way.)
The upped might need to to cost 7
considering the cost increase with other shields.