I've had mixed success maindecking Sol Ring and Mana Crypt. Sometimes you get a hand with a Crypt and a Null Rod, and feel like a silly goose. But sometimes you need a t1 Thought-Knot Seer and the mana rocks do the heavy lifting there.
I've also toyed around with Mockery of Nature in place of the World Breaker, works ok if you're saccing a Matter Reshaper for the Emerge cost, and still KOs Moat on cast. Other times, it can sit in your hand (but that happens plenty with World Break anyway, it seems for me). I also run ESGs, and desperately want the modo promos in paper foil haha