BSZ seems a good option, but it will need testing, Day can take anything for 4 mana, taking down a titan or a consecrated sphinx with BSZ req a lot of mana. Sun Titan looks quite okay to me, definitely worth testing, GSZ only grabs two creatures, so does not work. As for BoP this deck hasn't have any problems with mana, mostly thanks too Viridian's. I don't like transform creatures in a deck that can't draw-go and needs to be very active so Mayor won't work. - 1 Dismember +1 O-ring is a nice idea especially if we put Sun Titan, one card more that can be used from graveyard is a good thing.
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Problem with Myr Superion is, that unlike heartless pod I can play him only of mana creatures if I don't have Pod on table. This sometimes causes me to have him on hand without chance to play to him, and I wan;t for this deck, to be able to win when I either don't have pod or it get's shut down or destroyed,
Modified SB to include 2 Memoricide, and 1 Extraction, will need some testing on how that changes MU with Valakut.
I'm Thinking about adding 2 Memoricide to side, as they should be able to hit Green Titan before they come out when I`m on play, slowing Valakut a bit.
Inkmoth are used more akin to Mutacaults as a land pulled blocker more than win condition, but if need arises I can grind with them. EDIT: Added sideboard Torpor Orb as it really helps to shutdown modern Caw Go