We've seen it before the infinite sapling swarm that happens when Sporemound and Life and Limb are on the field together. This deck pushes to make that happen as fast as possible.
With Enter the Unknown,Utopia Mycon and Sprout/Sprout Swarm working to get you to four mana as fast as possible after which Life and Limb easily make your next five by tapping any remaining Saprolings and sacking your forest as though they were Saprolings.
If you are missing a combo piece there are several cards to help seek them out. Commune with the Gods is going to be your best bet to dig through the top of your deck for it the two center pieces. And if you are certain that Sporemound wont be countered and you can play it this turn then Summoner's Pact is a way to grab it and defer the cost to next turn when you have a million lands.
As for putting the breaks on the combo once it does start, we have the lovely card:Glutonous Slime and Mycoloth that can devour a certain Sporemound. card:Glutonous Slime has flash but Mycoloth is rather useless from your hand (we would want them in your library but more on that in a sec). In addition to halting the combo, these two cards can become massive creatures. Unfortunately neither have trample so be sure to keep a good chunk of Saprolings on hand for a big swing at your opponent.
If you need a one of the creatures to end the maddening combo again Summoner's Pact works well to grab Gluttonous Slime and Chord of Calling will let you flip through your library and drop your single Mycoloth onto the battlefield for a low low cost once you have mana. Also if you played it before the madness began then Fungal Plots gives you all the optional card draw you could dream of to dig for the creatures.
To finish, once the combo is completed you have a massive creature with which to swing with and a million tiny followers as well. Vitaspore Thallid is going to let you do it on the same turn, gotta love haste. For the small price of half your Saprolings the other half can swing in an epic show of destruction with you mighty card:Glutonous Slime or Mycoloth leading the way.
Note: Blasting Station works well with the deck but it slows it down substantially requiring an additional 3 mana () to be spend before the combo goes off due to its lack of flash.
