I perfer sneaky Humuculous because he's cheaper, and i'm not going to boost any of my creatures much, this is more for Omniscience, armageddon, and stormtide.
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MInd crank?
Wheres your traumatize kid!? Time reversal? Curse of the blood tome? Geth? Jaces erasure? heck, mind crank and Sneaky Homunculus go a lonnnnggggg way
welp, for starts you have WAAAAY too many mana ramp cards. If its casual, id go with cultivates, OR use eldrazi cards (put all that mana to use) or make a wini deck that uses mana to make tokens. making it Green/ blue -- Green/ red might be better also, because green use more agro than black. Giving everything trample is also fun. black: you should go with death touch, but make them low costing ones, then you can have bigger green creatures come and deal the pain. giant growth > rampant growth. phyrexian obliderator doesn't have any real value, since there are many ways for white/ blue to get around it (ie. exile, return to hand, mind controll, arrest) and red will deal the damage straight to you. tourture is also a fun card to have when playing black.
How do you plan on getting Myr Superion on the feild? inkmoth is a creature and a land, that means that it doesn't technically produce mana as a creature.