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Just a fun idea. Most likely not going to win often, especially not at tournament levels. ie: this deck is just intended for fun.
The basic idea is to speed up the Saproling production off the fungi. This is done in multiple ways:The Fungi get a Spore counter every upkeep and Paradox Haze gives multiple upkeeps. (Multiple Hazes do stack)Sporesower Thallid gives extra Spore counters each upkeep. (Though only one to itself)Sporoloth Ancient reduces the number of Spore counters required to 2.Proliferate on Tezzeret's Gambit puts an additional Spore counter on each of the fungi. I included a single Novijen, Heart of Progress on the off chance the fungi have multiple Spore counters.
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I'd cut Sprout Swarm to fill the playsets of ancient and sporesower. You can never run less than 4 of those in fungus decks, having enough fungi is essential, otherwise 2 kill spells can lose you the game