Whenever a Saproling you control deals combat damage to a player, create that many 1/1 green Saproling creature tokens.
Build a mono-green Saproling army, then push damage through with trample to exponentially multiply your tokens via Shroofus's combat trigger. Each turn you flood the board, pump the team, and swing to convert combat damage into more Saprolings, snowballing toward a lethal overrun. Ramp early, deploy token engines, and protect Shroofus so the doubling loop keeps compounding.
Explosive, self-reinforcing token generation — one big trampling hit can double or triple your board
Mono-green consistency with deep ramp and excellent fight/overrun finishers
Goes very wide quickly, making board wipes painful for opponents to fully recover from
Cheap commander (MV3) that comes down early and immediately threatens snowball
Relies on combat connecting; pillowfort, fogs, and big blockers stall the engine
Vulnerable to board wipes — your whole strategy is on the battlefield
Mono-green means little interaction, no counterspells, and weak removal for problem permanents
Slow to close if Shroofus is repeatedly removed before combat triggers fire