Squirrel girl

Squirrel Girl is a mono-green Commander token/counters deck with a strong go-wide stompy plan. It ramps hard with mana dorks and land ramp, then floods the board with creatures and tokens from cards like Tendershoot Dryad, Avenger of Zendikar, Verdant Force, Hornet Queen, and likely The Unbeatable Squirrel Girl as the centerpiece.

Its main synergies revolve around +1/+1 counters and token doubling: Doubling Season, Parallel Lives, Branching Evolution, Hardened Scales, Vorinclex, Monstrous Raider, Evolution Sage, Karn’s Bastion, and Loyal Guardian help grow the team quickly. Cards like Champion of Lambholt, Ohran Frostfang, Rogue’s Passage, Overrun, Overcome, Zopandrel, and Return of the Wildspeaker turn that wide board into lethal combat damage.

Overall, it wins by ramping early, building an oversized token army, stacking counters/proliferate effects, and finishing with a big overrun-style swing.