The Clam of Pearls strategy is a key one. Though perhaps it should be toned down. Maybe if you could create a maximum number or change the resource cost of the gems. Though in consideration the Fever Fetish should be adjusted as well as the potential is still there to abuse; but not the key path.

The Staff of Storms has (in Dom2) always been overpowered. It's way to easy to totally negate archers.