Cast Stolen Identity by paying its mana cost, targeting a creature you control.
Holding priority, cast Dualcaster Mage by paying {1}{R}{R}.
When Dualcaster Mage enters the battlefield, it triggers, copying Stolen Identity, targeting Dualcaster Mage.
Resolve the copy of Stolen Identity, creating a token copy of Dualcaster Mage.
Repeat from step 3.

Infinite ETB

Infinite creature tokens

Infinite magecraft triggers

Dualcaster Mage

Stolen Identity

Cast Stolen Identity by paying {4}{U}{U}, creating a token copy of Combat Celebrant.
At the beginning of your combat phase, Brudiclad triggers, creating a 2/1 Phyrexian Myr creature token, then choosing to have all tokens you control become copies of the Combat Celebrant token.
Declare one of the Combat Celebrant copy as an attacker, choosing to exert it as it attacks.
The Combat Celebrant copy triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one.
Repeat from step 2.

Infinite combat phases

Infinite damage

Brudiclad, Telchor Engineer

Combat Celebrant

Cast Stolen Identity by paying its mana cost, targeting a creature you control.
Holding priority, cast Naru Meha either from your hand or from the command zone by paying {2}{U}{U} plus commander tax, if applicable.
When Naru Meha enters the battlefield, it triggers, copying Stolen Identity, targeting Naru Meha.
Resolve the copy of Stolen Identity, creating a token copy of Naru Meha.
Put either Naru Meha into your graveyard due to the legend rule.
Repeat from step 3.

Infinite LTB

Infinite death triggers

Naru Meha, Master Wizard

Cast Stolen Identity by paying {4}{U}{U}, creating a token copy of Timestream Navigator.
At the beginning of your combat phase, Brudiclad triggers, creating a 2/1 Phyrexian Myr creature token, then choosing to have all tokens you control become copies of the Timestream Navigator token.
Activate Timestream Navigator by paying {2}{U}{U} and tapping it and putting it onto the bottom of your library, causing you to take an extra turn after this one.
Move to your next turn.
Repeat from step 2.

Infinite turns

Timestream Navigator

Cast Stolen Identity by paying {4}{U}{U}, creating a token copy of Worldwalker Helm and a Map token.
Activate Urza's first ability by tapping a Worldwaker Helm and a Map, adding {U}{U}.
Activate a Worldwalker Helm by paying {1}{U} and tapping it, creating a token copy of the Worldwalker Helm token and two Map tokens.
Activate Urza's first ability twice by tapping the Maps, adding {U}{U}.
Repeat from step 3.

Infinite tapped Map tokens

Urza, Lord High Artificer

Worldwalker Helm

Declare Combat Celebrant and the creature with Stolen Identity encoded as attackers, choosing to exert Combat Celebrant as it attacks.
Combat Celebrant triggers, untapping all other creatures you control and to get an additional combat phase after this one.
Deal combat damage to an opponent using the creature that has Stolen Identity encoded.
Stolen Identity triggers, casting a copy of itself without paying its mana cost.
Resolve Stolen Identity, creating a token copy of Combat Celebrant.
Repeat each combat phase using the Combat Celebrant token instead.

Infinite combat damage

Infinite mana creatures you control can produce

Infinite storm count

Infinite untap of creatures you control

Anger

Urabrask the Hidden

Cast Mind's Desire for {4}{U}{U}.
Eye of the Storm and Mind's Desire each trigger.
Resolve the Mind's Desire trigger, copying it zero times.
Resolve the Eye of the Storm trigger, exiling Mind's Desire, copying Mind's Desire and Stolen Identity, and casting the Mind's Desire copy then the Stolen Identity copy, targeting Mirror of Fate, without paying their mana costs.
The Mind's Desire copy triggers, creating an additional Mind's Desire copy for each spell cast before it this turn.
Resolve those copies, exiling random cards from your library that you may play this turn.
Resolve the Stolen Identity copy, creating a token copy of Mirror of Fate.
Activate any Mirror of Fate by tapping and sacrificing it, exiling all cards from your library and putting Stolen Identity from exile on top of your library.
Resolve the remaining Mind's Desire copy, exiling Stolen Identity from your library and allowing you to cast it this turn.
Cast Stolen Identity from exile without paying its mana cost, choosing any target.
Eye of the Storm triggers, exiling Stolen Identity, copying Mind's Desire and Stolen Identity, and casting the Mind's Desire copy then the Stolen Identity copy, targeting Mirror of Fate, without paying their mana costs.
The Mind's Desire copy triggers, creating an additional Mind's Desire copy for each spell cast before it this turn.
Resolve these copies, failing to exile anything from your empty library.
Resolve the Stolen Identity copy, creating a token copy of Mirror of Fate.
Repeat from step 8.
Once you have infinite storm count, repeat the loop but put Brain Freeze on top of your library with a Mirror of Fate activation in step 8.
Once Mind's Desire has exiled Brain Freeze, cast Brain Freeze from exile without paying its mana cost.
Brain Freeze and Eye of the Strom each trigger.
Resolve Brain Freeze's trigger, creating any number of copies of itself targeting any number of players.

Infinite mill

Infinite self-mill

Eye of the Storm

Mind's Desire

Mirror of Fate

Brain Freeze

Fervor

Cast Stolen Identity by paying {4}{U}{U}, targeting Hellkite Courser.
Holding priority, activate Rootha by paying {2} and returning it to your hand, targeting Stolen Identity.
Choose to have Rootha returned to the command zone instead of your hand.
Resolve the Rootha ability, copying Stolen Identity, targeting Hellkite Courser.
Resolve the copy of Stolen Identity, creating a token copy of Hellkite Courser.
The Hellkite Courser token enters the battlefield, putting Rootha from the command zone onto the battlefield.
Activate Ashnod's Altar by sacrificing the Hellkite Courser token, adding {C}{C}.
Repeat from step 2.

Infinite sacrifice triggers

Rootha, Mercurial Artist

Hellkite Courser

Ashnod's Altar

Cast Stolen Identity by paying {4}{U}{U}, creating a token copy of Basalt Monolith.
Activate the token Basalt Monolith's first ability by tapping it, adding {C}{C}{C}.
Roxanne's second ability triggers, adding {C}.
Activate the token Basalt Monolith's second ability by paying {3}, untapping it.
Repeat from step 2.

Infinite colorless mana

Roxanne, Starfall Savant

Basalt Monolith

Mass Hysteria

Combos with "Stolen Identity"