Since this deck centers mainly around counters on Lux Cannon and Titan forge, you should add some artifact proliferate, to speed up the counters a bit? Maybe Contagion Engine and Voltiac key? With the Myr Galvanizer infinite mana combo, you could proliferate 4x a turn with Contagion Engine + Voltiac key.
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I'm liking this deck! I would suggest adding Grindclock, or replacing Shriekhorn with it. Shriekhorn is good for quick milling but maximum mill is 2, while Grindclock can go much higher. Everflowing Chalice is faster compared to Sphere of the Suns also!
Very interesting deck! Would like to test this deck out!
I absolutely love this deck! I have about 90% of these cards already, so I'm gonna try this deck out!
Wow! Awesome deck! A bit on the expensive side though!