The great thing about Affinity in Modern Masters is that the best cards in your deck arent very appealing to other players, so youll have the opportunity to pick them up very late
The graveyard hate also keeps the reanimator decks in check

The Mycotyrant | Commander | Stephen Johnson Commander (1) 1 The Mycotyrant Creatures (32) 1 Caustic Caterpillar 1 Craterhoof Behemoth 1 Dawntreader Elk 1 Deathbloom Thallid 1 Deathbonnet Sprout 1 Deathspore Thallid 1 Dreampod Druid 1 Fertilid 1 Heartwood Storyteller 1 Jade Mage 1 Mold Folk 1 Mold Shambler 1 Mycoloth 1 Myconid Spore Tender 1 Nemata, Primeval Warden 1 Pitiless Plunderer 1 Rot Shambler 1 Sakura-Tribe Elder 1 Slimefoot, the Stowaway 1 Spore Crawler 1 Sporecrown Thallid 1 Sporemound 1 Tendershoot Dryad 1 Thallid Omnivore 1 Thallid Shell-Dweller 1 Thelonite Hermit 1 Tukatongue Thallid 1 Undercellar Myconid 1 Verdant Force 1 Voice of Many 1 Wood Elves 1 Yavimaya Sapherd Instants (5) 1 Fungal Infection 1 Fungal Rebirth 1 Putrefy 1 Second Harvest 1 Sprout Swarm Sorceries (3) 1 Diabolic Intent 1 Finale of Devastation 1 Rampant Growth Enchantments (14) 1 Beastmaster Ascension 1 Deathreap Ritual 1 Doubling Season 1 Fecundity 1 Fists of Ironwood 1 Fungal Plots 1 Golgari Germination 1 Life and Limb 1 Moldervine Reclamation 1 Necrogenesis 1 Night Soil 1 Parallel Lives 1 Trudge Garden 1 Verdant Embrace Artifacts (6) 1 Ashnod's Altar 1 Desecrated Tomb 1 Nim Deathmantle 1 Sol Ring 1 Throne of the God-Pharaoh 1 Wayfarer's Bauble This is a first draft and could be moved in all sorts of different directions

Enchantment ramp: Fertile Ground, Wild Growth, Wolfwillow Haven, etc
The typical cactuar uses a move called 1,000 Needles, which deals a static 1,000 points of damage, but the jumbo-sized cactuar has ten times the amount of spinesand ten times the amount of pain
This card could draw you a lot of cards for just 3 mana if you're lucky