Uhh ... guilt? AI would probably play it on the wrong cards.
Dimensional shields are ... a problem. Maybe have it unplayable on Aether cards? Would fit thematically, I suppose, if they were considered "immaterial".
Any suggestions?
lol@guilt -- 2 out of 3 turns is still enough to cripple your ability to play cards, especially when combined with other denial (BH, EQ, Nightmare, Pest, etc.)
If it ever makes it into the game, the AI will probably have a priority list created by Zanz that allows it to choose the right targets.