Standard Saprolings Token. Swarm them with tokens that are buffed by Sporecrown Thallid and Tendershoot Dryad. The dryad is the monster in this deck as if it sticks around, it will be generating a token every turn. There are also interactions with Slimefoot, the Stowaway help punish board wipes, and also to help against control by interacting with Fungal Plots to slowly drain if you need to hold back. Skysovereign, Consul Flagship can help fly over an opposing board and slowly ping down creatures or planeswalkers. Also an early Driven can really give you the upper hand as aggro decks won't be able to recover and you make control decks pitch all of their answers.

I have not played magic in a few years, so any advice is welcome as I have no idea what the standard environment is like.

Update 2: After this weekend I have removed Metallic Mimic and put in more Fatal Push, Driven, and a single of Growing Rites of Itlimoc and Journey to Eternity .

Update: Removed Song of Freyalise and Fungal Infection, Walking Ballista and 1 forest. Added Metallic Mimic, Blossoming Defense, Fatal Push, a Fungal Plots main,and another Tendershoot Dryad. I was play testing against a mono black control deck. I found the deck is pretty vulnerable to board wipes and if you lose all your creatures song is a dead card. This feels like it should play aggressive and without a ton of mana walking ballista never got very big. The mimics buff your saprolings and also go to the graveyard for fungal plots and Liliana interaction. I think I was in between aggro and midrange and this pushes it a bit more to the aggro side. The fungal plots will allow a response to saprolings dying provide some graveyard interaction. Fungal infection seemed pretty weak, but I was playing a controlish deck that didn't have any small creatures. Will re-evaluate after tonight's fnm