Legendary Creature — Elf Advisor

Tromell, Seymour's Butler

Mana value3EDHREC#4,414

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The Commander

Each other nontoken creature you control enters with an additional +1/+1 counter on it.

{1} , {T} : Proliferate X times, where X is the number of nontoken creatures you control that entered this turn. (To proliferate, choose any number of permanents and/or players, then give each another counter of each kind already there.)

Guide

Gameplan

Tromell is a mono-green +1/+1 counters engine: every nontoken creature you cast enters bigger, then you proliferate based on how many creatures hit the battlefield that turn to snowball counters across your whole board. You ramp into a wide, oversized creature base, activate Tromell each turn to multiply counters, and close with overwhelming stats or counter-based payoffs.

Strengths

Free anthem effect that scales every nontoken creature you play, no setup required.
Repeatable proliferate gives access to counter synergies far beyond +1/+1 (loyalty, charge, infect, experience).
Cheap 3-mana commander that's easy to recast and immediately impactful.
Mono-green gives consistent ramp and resilient mana, supporting a flood of creatures.

Weaknesses

A single board wipe undoes huge counter investment.
Tromell himself is fragile and a tempting removal target; without him the engine stalls.
Mono-green lacks interaction, card-draw fixing, and ways to break parity in stax/control matchups.
Proliferate only triggers on creatures that entered that turn, so go-wide flickers and token strategies don't fuel it.

Key Cards

Hardened Scales — Stacks with Tromell so each creature enters with even more counters, accelerating the snowball.
Branching Evolution — Doubles the counters from Tromell's enter trigger and from every proliferate activation.
Doubling Season — Combines with Tromell to flood the board with massively oversized creatures instantly.
Cathars' Crusade — Each creature entering pumps the whole team, and Tromell then proliferates that surplus.
The Ozolith — Banks counters when creatures die, protecting your investment against removal and wraths.
Inkmoth Nexus — Turns proliferate into a poison clock, giving the deck a fast alternate kill.

Upgrade Path

Add counter doublers (Hardened Scales, Branching Evolution, Doubling Season) and protection (Heroic Intervention, Bolster effects, The Ozolith) to make the engine resilient. Tighten the mana with fast green ramp (Sol Ring, Three Visits, Nature's Lore) so you deploy multiple creatures per turn to maximize proliferate. For higher power, lean into an infect package or a Craterhoof/Pathbreaker Ibex finisher to convert your counter advantage into immediate lethal.

Core Cards

The most-played cards for this commander, built from aggregated deck data (the Mythic Graph). Build public decks to seed it.

Win Conditions

▸Overwhelming combat damage from a board of proliferated, oversized creatures.
▸Trample finishers like Pathbreaker Ibex or Overwhelming Stampede turning counters into a one-shot.
▸Infect/poison kills via Inkmoth Nexus or infect creatures plus repeated proliferate.
▸Craterhoof Behemoth-style alpha strike off a wide, buffed board.

Archetypes

+1/+1 Counters — Tromell's static buff and proliferate make him a premier counters-matters payoff.
Proliferate Toolbox — His tap ability multiplies any counter type, enabling planeswalker, infect, and energy synergies.
Big Green Stompy — Ramp into oversized creatures and beat down with raw, ever-growing stats.
Infect/Poison — Proliferate on poison counters turns a few infect hits into lethal quickly.