I mean, if your brainstorming here lets think outside the box.
Leyline of Anticipation - Lets you go under them turn 0 and get presence. This could mean having a mox into a counterspell or just being able to establish before they lock you out.
Chancellor of the Annex - This one is interesting because the tax cannot be payed off shops. If they have enough moxen they can play into it but its still a 0 for 1 in that case that can buy you tempo. I like this card because it has game against other strategies so long as you can find use for the dork attached or a way to trade it in for something else.
Chancellor of the Tangle - Free mana turn one to get out from under a sphere.
Crash, Pulverize, Abolish - All have Costs that can help you out from under spheres. I know these have been done before but they may merit another look?