I think you need to read the text on Nemesis of Mortals.
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Read Lotleth Troll. He has an ability with 'Discard a creature card' as a cost.
Grisly Salvage is significantly better than Mulch in this deck.
Yes, it is staying standard.
Oh, I missed that. When I thought of the combo I for some reason assumed it developed infinite of both blue and green instead of just green. I shall look into your alternates and revamp the concept.
I really want to splash Black so I can add Perplex for more 3 cmc transmute and control, but I couldn't find any other reason to add it black (and it seems like a waste to add a color for a single card.
I looked at Phyrexian Processor but decided against it because it can't be done at instant speed. Plunge into Darkness, Wall of Blood, and Blood Celebrant are just better for that purpose. Giving your opponent a turn when you are at 1 life is not the best move.