Go Infinite with Powerstone Shard and Cogwork Assembler, then play an arbitrarily large Walking Ballista. The ways to go infinite are as follows:

NOTE: These all assume you have a Cogwork Assembler on the field. * assumes you are tapped out

*4 Untapped Powerstone Shard

*4 Powerstone Shard

A 2/2 split of untapped and tapped Powerstone Shard

Using this info, here are all the possible combinations to get infinite mana, not including the ones listed above:

The synergy of Paradox Engine + Jhoira, Weatherlight Captain is also in this deck as a way to dig for your combo; This adds consistency and is also a fun secondary combo with the Aetherflux Reservoir in the Sideboard :)