Cast Undercover Operative by paying {2}{U}{U}, choosing to have it enter the battlefield as a copy of Wispweaver Angel.
When Undercover Operative enters the battlefield, it triggers, blinking Wispweaver Angel.
When Wispweaver Angel enters the battlefield, it triggers, blinking Undercover Operative, with Undercover Operative entering the battlefield as a copy of Wispweaver Angel.
Repeat from step 2.

Infinite ETB

Infinite LTB

Wispweaver Angel

Undercover Operative

Activate Undercover Operative by paying {1}{U}, shuffling Undercover Operative into your library and milling your entire library due to it not having a card named Mirror-Mad Phantasm in it.

Infinite self-mill

Mirror-Mad Phantasm

Activate Kiora's Follower by tapping it, targeting Undercover Operative.
Illusionist's Bracers triggers, copying Kiora's Follower's ability.
Resolve both Kiora's Follower abilities, untapping Undercover Operative and another permanent you control.
Activate Undercover Operative by tapping it, untapping Kiora's Follower.
Repeat.

Infinite mana permanents you control can produce

Infinite untap of permanents you control

Kiora's Follower

Illusionist's Bracers

Cast Undercover Operative by paying {2}{U}{U}, choosing to have it enter the battlefield as a copy of Enduring Scalelord.
Undercover Operative enters the battlefield, triggering Cathars' Crusade, putting a +1/+1 counter on each creature you control.
Enduring Scalelord and Undercover Operative triggers.
Resolve the Undercover Operative trigger, putting a +1/+1 counter on itself.
Enduring Scalelord triggers, putting a +1/+1 counter on itself.
Repeat from step 4.

Infinite +1/+1 counters on Undercover Operative and Enduring Scalelord

Enduring Scalelord

Cathars' Crusade

Activate Adarkar Valkyrie by tapping it, targeting any legendary creature you control.
Cast Undercover Operative by paying {2}{U}{U}, choosing to have it enter the battlefield as a copy of the legendary creature targeted in step 1.
Put the legendary creature into your graveyard due to the legend rule.
Adarkar Valkyrie and Intruder Alarm trigger.
Resolve the Intruder Alarm trigger, untapping all creatures.
Holding priority, activate Adarkar Valkyrie by tapping it, targeting Undercover Operative.
Resolve the Adarkar Valkyrie trigger from step 4, returning the legendary creature to the battlefield from your graveyard.
Put Undercover Operative into your graveyard due to the legend rule.
Adarkar Valkyrie and Intruder Alarm trigger.
Resolve the Intruder Alarm trigger, untapping all creatures.
Holding priority, activate Adarkar Valkyrie by tapping it, targeting the legendary creature.
Resolve the Adarkar Valkyrie trigger from step 9, returning Undercover Operative to the battlefield from your graveyard as a copy of the legendary creature.
Repeat from step 3.

Infinite death triggers

Infinite mana creatures you control can produce

Infinite untap of all creatures

Adarkar Valkyrie

Intruder Alarm

Cast Chronomantic Escape by paying {4}{W}{W}, causing creatures to be unable to attack you until your next turn, and putting Chronomantic Escape into exile with three time counters on it.
At the beginning of your postcombat main phase, both copies of Sphinx of the Second Sun trigger, causing you to get two additional beginning phases after this phase.
Move to your first additional beginning phase.
At the beginning of your upkeep, Chronomantic Escape triggers, removing a time counter from itself.
Repeat from step 3 one additional time.
At the beginning of your next upkeep, Chronomantic Escape triggers, removing a time counter from itself and causing you to cast it without paying its mana cost.
Resolve Chronomantic Escape,  causing creatures to be unable to attack you until your next turn, and putting Chronomantic Escape into exile with three time counters on it.
Repeat from step 2.

Creatures cannot attack you

Chronomantic Escape

Sphinx of the Second Sun

Attack with Hoard Robber.
Hoard Robber triggers on combat damage to a player, creating three Treasure tokens, three Food tokens, and three Clue tokens.
Activate Time Sieve's ability by tapping Time Sieve and sacrificing five artifacts you control, taking an extra turn after this one.
Repeat.

Infinite turns

Hoard Robber

Time Sieve

Academy Manufactor

Activate Kiora's Follower by tapping it.
When Kiora's Follower becomes tapped, Judge of Currents triggers, causing you to gain 1 life.
Resolve Kiora's Follower's ability from step 1, untapping Undercover Operative.
Activate Undercover Operative by tapping it.
When Undercover Operative becomes tapped, Judge of Currents triggers, causing you to gain 1 life.
Resolve Undercover Operative's ability from step 4, untapping Kiora's Follower.
Repeat.

Infinite lifegain

Infinite lifegain triggers

Judge of Currents

Cast the artifact creature from your hand by paying {0}.
Diligent Excavator and Undercover Operative trigger, causing you to mill four cards.
The artifact creature enters the battlefield and dies as a state-based action due to having zero toughness.
Cast the artifact creature from your graveyard for its escape cost by paying {0} and exiling any three cards from your graveyard, except Thassa's Oracle if it is in your graveyard.
Repeat from step 2 until you have an empty library.
If Thassa's Oracle is in your hand, cast it by paying {U}{U}.
Otherwise, cast Thassa's Oracle  from your graveyard for its escape cost by paying {U}{U} and exiling three cards from your graveyard.
Thassa's Oracle enters the battlefield, causing you to win the game.

Near-infinite death triggers

Near-infinite ETB

Near-infinite LTB

Near-infinite storm count

Win the game

Artifact Creature with Mana Cost X and Toughness 0

Underworld Breach

Diligent Excavator

Thassa's Oracle

Cast Lightning Storm by paying {1}{R}{R}, targeting either copy of Stormchaser Drake.
Stormchaser Drake triggers, which due to Abundance causes you to reveal cards from the top of your library until you reveal a land card and put it into your hand.
Activate Lightning Storm by discarding a land card, putting that land card on the bottom of your library due to Wheel of Sun and Moon.
Resolve the Lightning Storm ability, putting two charge counters on it and changing the target to the other copy of Stormchaser Drake.
Repeat from step 2.
Once Lightning Storm has an arbitrarily large number of charge counters, activate it by discarding a land to change its target to any other target of your choosing to deal infinite damage to that target.

Infinite self-discard triggers

Infinite damage to one opponent

Lightning Storm

Stormchaser Drake

Wheel of Sun and Moon

Abundance

Cast The Master either from your hand or from the command zone by paying {U}{B} plus command tax, if applicable, choosing to have it enter the battlefield as a copy of Ruthless Technomancer.
When The Master enters the battlefield, it triggers, causing you to sacrifice Undercover Operative and create at least two Treasure tokens.
Activate a Treasure by tapping and sacrificing it, adding {B}.
Activate The Master by paying {B} and sacrificing a Treasure, returning Undercover Operative from your graveyard to the battlefield as a copy of The Master, which causes the Undercover Operative to be a copy of Ruthless Technomancer.
When Undercover Operative enters the battlefield, it triggers, causing you to sacrifice The Master and create two Treasure tokens.
Activate a Treasure by tapping and sacrificing it, adding {B}.
Activate Undercover Operative by paying {B} and sacrificing a Treasure, returning The Master from your graveyard to the battlefield as a copy of Ruthless Technomancer.
Repeat from step 2.

Infinite sacrifice triggers

The Master, Formed Anew

Ruthless Technomancer

Training Grounds

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