Oh snap, Black Sun's Zenith. This deck officially needs it.
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I like it, much more Myrful than mine. the mountains and swamp in the mana base take up a lot of room if they are only used for Mishra. I'd look for some cheap duals. actually, Crumbling Necropolis would be perfect for Mishra.
It could definitely be useful, but it's abilities are already present in Palladium Myr, Goblin Welder, and Myr Retriever. If it could untap via Galvanizer, it'd be an auto include hands down.
Contagion engine is very nice, but the beauty of Clasp is the 2-drop, doesn't hurt the curve. Engines pull the curve too far right for my taste. and if I were adding six drops, I would probably use Midnight Banshee, its basically an Engine that can swing.