Legendary Creature — Human Advisor

Grand Arbiter Augustin IV

Mana value4EDHREC#1,784Game ChangerYes

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The Commander

White spells you cast cost {1} less to cast.

Blue spells you cast cost {1} less to cast.

Spells your opponents cast cost {1} more to cast.

Guide

Gameplan

Grand Arbiter Augustin IV makes your white and blue spells cheaper while taxing every spell your opponents cast, letting you out-resource the table and lock the game down. Deploy mana rocks early, land the Arbiter, then stack additional taxes and counters to make the table's spells unaffordable. You grind out advantage through control pieces and close with a combo, a big finisher, or by simply running everyone out of mana.

Strengths

Asymmetric mana advantage: your spells get cheaper while opponents pay a tax, compounding over the game
Pairs with other tax effects to create near-total lockouts
UW gives access to the format's best counterspells, board wipes, and card draw
Cheap to recast and reasonable as an early threat
Naturally fuels stax and control shells without much support

Weaknesses

Massive removal magnet that the whole table wants dead immediately
Tax effects are symmetrical-feeling and paint a target on you politically
Slow starts can leave you behind ramp/combo decks before taxes come online
No card advantage or evasion on its own
Vulnerable to recursion-light hands once the Arbiter is removed repeatedly

Key Cards

Thalia, Heretic Cathar — Stacks additional tax-like friction by making opponents' creatures and lands enter tapped, slowing their tempo.
Lavinia, Azorius Renegade — Punishes free spells and big-mana plays, layering perfectly with the Arbiter's tax.
Smothering Tithe — Turns the tax-heavy slowdown into explosive treasure ramp to power your own expensive plays.
Rhystic Study — Capitalizes on opponents already short on mana, generating massive card advantage under the tax.
Knowledge Pool — Combined with the Arbiter's tax it can effectively lock opponents out of casting spells entirely.
Cyclonic Rift — A one-sided reset that the Arbiter makes cheaper and that closes grindy games.

Upgrade Path

Lean harder into asymmetric taxes (Thalia, Guardian of Thraben; Sphere of Resistance; Winter Orb; Static Orb) since you can pay around them better than opponents. Add fast mana and rocks (Mana Crypt, Mana Vault, Sol Ring, signets) so you set up before the table, and include a compact win like Isochron Scepter + Dramatic Reversal or Approach of the Second Sun. Tighten interaction with the best UW counters (Mana Drain, Swan Song, Mystic Confidence) and a reliable Arbiter protection/recursion package.

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

▸Assemble a stax lock (Knowledge Pool, Winter Orb, Static Orb) and grind opponents out
▸Drop a hard-to-answer finisher like Approach of the Second Sun or a large flier
▸Combo kill with something like Isochron Scepter + Dramatic Reversal into infinite mana
▸Out-value the table with card draw and counters until you cast an overwhelming Cyclonic Rift

Archetypes

Stax — The Arbiter's opponent tax is a core stax piece that stacks with sphere effects and resource denial.
Control — Cheaper counters and wraths plus opponent taxes let you dominate the late game.
Combo — Cheap UW spells and a soft lock buy time to assemble a two-card combo finish.
Spellslinger — Reduced costs on blue and white instants/sorceries enables value-dense interaction and finishers.