Fynn, the Fangbearer turns your cheap deathtouch creatures into a poison clock. Each creature with deathtouch that deals combat damage to a player gives that player two poison counters, and ten poison counters loses the game—so you need only five hits to close out a table. The deck floods the board with one-mana deathtouchers (Gnarlwood Dryad and Sedge Scorpion, plus 2 more creatures, and others) and uses trample-granting effects like Rancor, Primal Rage, and Overwhelming Stampede to push that poison damage through blockers.
Mana and tutors set the stage. Sol Ring and small mana dorks (Llanowar Elves, Elvish Mystic, Wirewood Elf) come down turn 1–2. Cultivate and Kodama's Reach find your second and third lands by turn 3, ensuring you hit your land drops and stay on curve. Deathtouch bodies flood the board. By turn 2–3, you're casting Gnarlwood Dryad and Branchblight Stalker, plus 3 more creatures—cheap creatures that already have deathtouch or gain it from Fynn. Trample unlocks the kill. Rancor and Primal Rage, plus 2 more similar cards grant your deathtouchers trample, letting them assign 1 damage to each blocker and push the rest as poison counters to the player. Fynn's trigger fires once per creature per combat, so a single unblocked deathtoucher deals two poison; a trample-enabled creature that gets through blockers also deals two. Proliferate accelerates the clock. Cankerbloom and Contagion Clasp, plus 3 more similar cards proliferate—they give each poison counter an additional copy. A player with three poison counters becomes five after one proliferate; one with five becomes seven. Contaminant Grafter and Venomous Brutalizer add poison directly (toxic 1 and toxic 3 respectively), and their combat damage triggers proliferate or draw cards, compressing the clock further. Overwhelming Stampede closes it. Once your board is wide, Overwhelming Stampede gives all your creatures +X/+X (where X is your biggest creature's power) and trample, turning a board of 1/1 deathtouchers into a lethal poison surge in a single turn.