At the beginning of your end step, Thassa triggers, blinking Hoarding Broodlord.
When Hoarding Broodlord enters the battlefield, it triggers, searching your library for Nexus of Fate if it's in your library, and exiling it.
Cast Nexus of Fate either from your hand or from exile by paying {5}{U}{U}, causing you to take an extra turn after this one and shuffle Nexus of Fate into your library.
Repeat each turn.

Infinite turns

Hoarding Broodlord

Nexus of Fate

Thassa, Deep-Dwelling

Cast Appa by paying {2}{W}{W}.
When Appa enters, its first ability triggers, exiling Restoration Angel with the ability to cast it later from exile.
Cast Restoration Angel from exile by paying {0} and tapping Appa and another creature you control.
Appa's second ability triggers, creating a 1/1 Ally creature token.
When Restoration Angel enters, it triggers, blinking Appa.
Repeat from step 2.

Infinite LTB

Infinite ETB

Infinite storm count

Infinite tapped creature tokens

Appa, Steadfast Guardian

Restoration Angel

At the beginning of your end step, Conjurer's Closet triggers, blinking Hoarding Broodlord.
When Hoarding Broodlord enters the battlefield, it triggers, searching your library for Nexus of Fate if it's in your library, and exiling it.
Cast Nexus of Fate either from your hand or from exile by paying {5}{U}{U}, causing you to take an extra turn after this one and shuffle Nexus of Fate into your library.
Repeat each turn.

Conjurer's Closet

Cast Broodlord, choosing {3} for X, but paying a total of {G} due to Animar.
Animar triggers, putting a +1/+1 counter on it.
Broodlord enters the battlefield, putting three +1/+1 counters on Crystalline Crawler.
Activate Crystalline Crawler's second ability three times by removing three +1/+1 counters from it, adding {1}{G}{G}.
Activate Temur Sabertooth by paying {1}{G}, returning Broodlord from the battlefield to your hand.
Repeat.
You may choose larger numbers for X in future iterations to get infinite +1/+1 counters, colored mana, and card draw.

Infinite +1/+1 counters

Infinite card draw

Infinite colored mana

Infinite draw triggers

Infinite blinking of creatures you control

Animar, Soul of Elements

Broodlord

Temur Sabertooth

Crystalline Crawler

At the beginning of your end step, Soulherder's second ability triggers, blinking Hoarding Broodlord.
When Hoarding Broodlord enters the battlefield, it and Soulherder's first ability trigger.
Resolve the Soulherder trigger, putting a +1/+1 counter on it.
Resolve the Hoarding Broodlord trigger, searching your library for Nexus of Fate if it's in your library, and exiling it.
Cast Nexus of Fate either from your hand or from exile by paying {5}{U}{U}, causing you to take an extra turn after this one and shuffle Nexus of Fate into your library.
Repeat each turn.

Soulherder

At the beginning of your end step, Teleportation Circle triggers, blinking Hoarding Broodlord.
When Hoarding Broodlord enters the battlefield, it triggers, searching your library for Nexus of Fate if it's in your library, and exiling it.
Cast Nexus of Fate either from your hand or from exile by paying {5}{U}{U}, causing you to take an extra turn after this one and shuffle Nexus of Fate into your library.
Repeat each turn.

Teleportation Circle

Cast Beacon of Tomorrows either from your hand or from exile by paying {6}{U}{U}, causing you to take an extra turn after this one and shuffle Beacon of Tomorrows into your library.
At the beginning of your end step, Thassa triggers, blinking Hoarding Broodlord.
When Hoarding Broodlord enters the battlefield, it triggers, searching your library for Beacon of Tomorrows and exiling it.
Repeat each turn.

Beacon of Tomorrows

Cast Beacon of Tomorrows either from your hand or from exile by paying {6}{U}{U}, causing you to take an extra turn after this one and shuffle Beacon of Tomorrows into your library.
At the beginning of your end step, Conjurer's Closet triggers, blinking Hoarding Broodlord.
When Hoarding Broodlord enters the battlefield, it triggers, searching your library for Beacon of Tomorrows and exiling it.
Repeat each turn.

Cast Beacon of Tomorrows either from your hand or from exile by paying {6}{U}{U}, causing you to take an extra turn after this one and shuffle Beacon of Tomorrows into your library.
At the beginning of your end step, Soulherder's second ability triggers, blinking Hoarding Broodlord.
When Hoarding Broodlord enters the battlefield, it and Soulherder's first ability trigger.
Resolve the Soulherder trigger, putting a +1/+1 counter on it.
Resolve the Hoarding Broodlord trigger, searching your library for Nexus of Fate and exiling it.
Repeat each turn.

Cast Beacon of Tomorrows either from your hand or from exile by paying {6}{U}{U}, causing you to take an extra turn after this one and shuffle Beacon of Tomorrows into your library.
At the beginning of your end step, Teleportation Circle triggers, blinking Hoarding Broodlord.
When Hoarding Broodlord enters the battlefield, it triggers, searching your library for Beacon of Tomorrows and exiling it.
Repeat each turn.

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