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Awesome deck, what about Liquimetal Coating for early game "artifact" destruction. Shattering Spree and the 3 mana destroy artifact deal 3 damage card would do well in here as well. Maybe not exactly the direction you wanted to go with it. I was thinking of doing something similar to this for my next modern deck.
I think your opponent would concede by the time ALL THEIR PERMANENTS EXPLODE and yours don't. Once that happens thanks to Vandalblast and Mycosynth Lattice , the opponent will be on the backfoot in terms of dealing with the hexproof-y Geist of Saint Traft .as they have no land to cast... well, spells.
It would be nice to have one more Geist of Saint Traft though, just to be sure. There is a chance two could be wiped out