Legendary Creature — Time Lord Doctor

The Twelfth Doctor

Mana value5EDHREC#7,132

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The Commander

The first spell you cast from anywhere other than your hand each turn has demonstrate. (When you cast that spell, you may copy it. If you do, choose an opponent to also copy it. A copy of a permanent spell becomes a token.)

Whenever you copy a spell, put a +1/+1 counter on The Twelfth Doctor.

Guide

Gameplan

You're an Izzet spellslinger/Doctor's Companion commander that turns cards cast from anywhere-but-hand into two-for-one (or three-for-one) value engines. Lean on flashback, foretell, suspend, impulse-draw exile-cast, and adventure spells to trigger demonstrate, copying your best spell each turn while The Twelfth Doctor grows into a real clock. You generate overwhelming card and board advantage, then close with copied burn, big X-spells, or a buffed Doctor (often paired with a Companion for commander damage).

Strengths

Built-in card advantage: copying spells cast from exile/graveyard generates massive value over a game
Grows itself into a relevant threat via +1/+1 counters every time you copy
Demonstrate lets you copy game-warping spells like board wipes, big draw, or X burn
Flexible engine that rewards many alternative-cast mechanics already strong in Izzet
Can pair with a Doctor's Companion for a powerful two-card commander package

Weaknesses

Five mana and dies to spot removal, resetting the counter accumulation
Demonstrate only triggers on the FIRST such spell each turn, so it can be slow
Forces you to give an opponent a copy too, which can backfire on symmetric effects
No inherent protection or evasion; relies on the deck for defense
Color identity lacks access to unconditional removal and lifegain

Key Cards

Underworld Breach — Recasting spells from your graveyard repeatedly chains demonstrate triggers for explosive value or combo turns.
Snapcaster Mage — Flashes back an instant/sorcery from your graveyard, reliably enabling a demonstrate copy and an extra counter.
Mizzix's Mastery — Casting a huge spell from exile and copying it via demonstrate can win on the spot.
Brainstorm — A cheap cantrip you can cast from graveyard via flashback effects to trigger copies while smoothing draws.
Lier, Disciple of the Drowned — Gives all your instants and sorceries flashback, turning your graveyard into an endless stream of demonstrate triggers.
Increasing Vengeance — Doubles down on copying, and casting it off the top or graveyard adds even more copies to your stack.

Upgrade Path

Add more cheap, repeatable cast-from-elsewhere enablers (Snapcaster Mage, Lier, Underworld Breach, foretell and suspend spells) to guarantee a demonstrate trigger every turn, and tune the mana base with fast rocks like Mana Crypt and Mox Diamond. Lean into a dedicated combo finish (Underworld Breach + Lion's Eye Diamond, or Mizzix's Mastery on a haymaker) and add protection like Veil of Summer-style answers and counterspells to defend your engine. Finally, pick a strong Doctor's Companion such as a card-advantage or evasion-focused partner to give the deck a reliable backup plan.

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

▸Copied X-burn or storm-style damage (e.g. doubled Comet Storm / Fireball)
▸Commander damage from a counter-laden Doctor, often with a Doctor's Companion
▸Underworld Breach combo chains for infinite value or lethal
▸Grinding opponents out with two-for-one spell copies until you out-resource the table

Archetypes

Spellslinger — Demonstrate doubles your best instant or sorcery each turn while building counters on the commander.
Combo — Underworld Breach and copy loops let you recast and copy spells for game-ending chains.
Voltron / Doctor's Companion — Stacked +1/+1 counters plus a Companion turn the Doctor into a fast commander-damage clock.
Control — Copying counterspells, removal, and board wipes lets you dominate the stack and the board.