I think jinxed idol could be effective. I personally have limited responses for artifacts atm and at the very least it'll eat a turn 2 mana leak opening up further plays.
I don't see it being a devasting threat late game though. Tactically squeezing that in through the counter wall isn't going to be securing a win.
I think it's a powerful card early, but decreases in value as the game goes. But i guess luminarch is very much the same and I've lost to that card on a number of occassions when it hits early.