Cool ideas, all around. I also like the idea of "swapping out" old Conditions for new ones as a means of getting them into the game.
The active player may apply this condition instead of Immobilized.
You may only attack with one blue die. Heroes may not use
surge abilities on equipped weapons. Monsters may not use surge abilities.
Discard this card or token at the end of your turn.
This would be my preference, purely thematically.