Not sure why Galvanic Blast is not in there. Usually you will have metalcraft and if you don't, it's still removal and seems better than a solo shatter and Melt terrain.
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Sun Titan is great and not sure how Mnemonic wall would work although there are a ton of great interactions with it and Venser if both manage to stay on the board. I focused more with venser and Trinket Mage to fetch me removal (Brittle Effigy), untapper (Voltaic Key), Mana Accelerators (Mox, Chalice) since Mnemonic wall might be too slow. The key helps speed up ratchet bombs and lux cannons. Let me know how this deck works