Legendary Creature — Human Elf Cleric

Maester Seymour

Mana value3EDHREC#4,125

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The Commander

At the beginning of combat on your turn, put a number of +1/+1 counters equal to Maester Seymour's power on another target creature you control.

{3} {G} {G} : Monstrosity X, where X is the number of counters among creatures you control. (If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.)

Guide

Gameplan

Maester Seymour is a mono-green +1/+1 counters engine that snowballs your team into lethal creatures. Each combat he dumps counters equal to his power onto another creature, and his monstrosity ability scales with the total counters across your board—so you grow Seymour first, then pour counters into a single trampling threat. Win by going wide-and-tall with counter synergies or by stacking everything onto one carrier and swinging for the fences.

Strengths

Self-sustaining counter loop: growing Seymour increases what he distributes each combat
Monstrosity scales explosively once you have counters spread across creatures
Mono-green gives the best ramp and counter support in the format
Cheap commander (3 MV) that comes down early and starts working immediately
Plays well with doublers and proliferate for runaway boards

Weaknesses

The combat trigger only adds counters during your combat, so it's slow out of the gate
Heavily reliant on Seymour staying on the battlefield—prone to commander tax and removal
Mono-green lacks interaction; little answer to combo, control, or flyers
Targets a single creature, so without trample or evasion you can get chump-blocked
Wraths and board sweepers undo your invested counters in one turn

Key Cards

Hardened Scales — Adds an extra counter to every placement, accelerating both Seymour's growth and his distribution.
Branching Evolution — Doubles all +1/+1 counters placed, supercharging both the combat trigger and monstrosity.
Doubling Season — Doubles every counter Seymour puts out, making his loop snowball out of control.
Inkmoth Nexus — A manland that turns your stacked counters into a fast infect/poison kill or evasive carrier.
The Ozolith — Banks all your counters when creatures die, protecting your investment through removal.
Cathars' Crusade — Each creature you cast adds counters to the whole team, feeding monstrosity and Seymour's math.
Inspiring Call — Cheap protection and card draw that scales with your counter-laden board.
Vorinclex, Monstrous Raider — Doubles your counters while halving opponents', a brutal asymmetric upgrade to the engine.

Upgrade Path

Lean into counter doublers (Hardened Scales, Branching Evolution, Doubling Season, Vorinclex) and proliferate effects to make every combat exponential. Add protection like Heroic Intervention, Snakeskin Veil, and The Ozolith so a single wrath doesn't reset your work, plus trample/evasion enablers (Rancor, Inkmoth Nexus) to ensure counters convert to damage. Top it off with Craterhoof Behemoth or Overwhelming Stampede as a reliable finisher and ramp like Sol Ring and Three Visits to deploy Seymour ahead of schedule.

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

▸Pump a single trampling or evasive creature huge and swing for lethal commander damage
▸Go wide with a counter-laden team and finish with Overrun or Craterhoof Behemoth
▸Suit up an infect creature like Inkmoth Nexus and deal 10 poison fast
▸Overwhelming board presence after a few uncontested combat triggers

Archetypes

+1/+1 Counters — His entire kit revolves around generating, distributing, and doubling counters across your board.
Voltron — You can funnel all of Seymour's counters plus monstrosity onto a single evasive creature for a one-shot kill.
Stompy / Go-Wide Aggro — Counter doublers and anthem effects let you flood the board with oversized creatures to overrun the table.
Combo — Counter-on-attack triggers and infect/persist synergies enable deterministic kills with the right enablers.