try Tidewater Minion, its a good way to add infinit mana
I love the idea but the changes i'd make would be to take out the ponders and add 2 more muddle the mixture, a lightning greaves and a whispersilk cloak. i would also take out 2 of the invokers to sub in 2 Omnath, Locus of Mana. the mixtures add some more control to the deck to stop any AOE destruction cards(day of judgement, etc.) or anything thtd blow up part of the infinite mana and also its 2 transmute can be used to either pul your sprout swarm or the greaves. whereas you lose the trample with the locust you can now transmute it with the phantasms. the whispersilk cloak i added cause it can also be transmuted and if your popping of the combo you can transmute it then play/equiped it to an invoker or locust to keep em from dieing or being blocked.