Activate Xenic Poltergeist by tapping it, causing Ugin's Nexus to become an artifact creature until end of turn.
At the beginning of your end step, Athreos' second ability and Nahiri's Resolve trigger.
Resolve the Athreos trigger, putting a coin counter on Ugin's Nexus.
Holding priority, activate Ashnod's Altar by sacrificing Ugin's Nexus, adding {C}{C}.
Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
Athreos' third ability triggers, causing you to return Ugin's Nexus from exile to the battlefield.
Resolve the Nahiri's Resolve trigger from step 2, exiling Ugin's Nexus until your next upkeep.
Move to your extra turn.
At the beginning of your upkeep, Nahiri's Resolve triggers, returning Ugin's Nexus from exile to the battlefield.
Repeat.

Infinite turns

Athreos, Shroud-Veiled

Ugin's Nexus

Xenic Poltergeist

Nahiri's Resolve

Ashnod's Altar

Activate Karn by paying {1}, causing Ugin's Nexus to become an artifact creature until end of turn.
At the beginning of your end step, Athreos' second ability and Nahiri's Resolve trigger.
Resolve the Athreos trigger, putting a coin counter on Ugin's Nexus.
Holding priority, activate Ashnod's Altar by sacrificing Ugin's Nexus, adding {C}{C}.
Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
Athreos' third ability triggers, causing you to return Ugin's Nexus from exile to the battlefield.
Resolve the Nahiri's Resolve trigger from step 2, exiling Ugin's Nexus until your next upkeep.
Move to your extra turn.
At the beginning of your upkeep, Nahiri's Resolve triggers, returning Ugin's Nexus from exile to the battlefield.
Repeat.

Karn, Silver Golem

Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Ugin's Nexus to become an artifact creature until end of turn.
At the beginning of your end step, Athreos' second ability and Nahiri's Resolve trigger.
Resolve the Athreos trigger, putting a coin counter on Ugin's Nexus.
Holding priority, activate Ashnod's Altar by sacrificing Ugin's Nexus, adding {C}{C}.
Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
Athreos' third ability triggers, causing you to return Ugin's Nexus from exile to the battlefield.
Resolve the Nahiri's Resolve trigger from step 2, exiling Ugin's Nexus until your next upkeep.
Move to your extra turn.
At the beginning of your upkeep, Nahiri's Resolve triggers, returning Ugin's Nexus from exile to the battlefield.
Repeat.

Karn, the Great Creator

Activate Xenic Poltergeist by tapping it, causing Ugin's Nexus to become an artifact creature until end of turn.
At the beginning of your end step, Athreos' second ability and Nahiri's Resolve trigger.
Resolve the Athreos trigger, putting a coin counter on Ugin's Nexus.
Holding priority, activate Phyrexian Altar by sacrificing Ugin's Nexus, adding one mana of any color.
Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
Athreos' third ability triggers, causing you to return Ugin's Nexus from exile to the battlefield.
Resolve the Nahiri's Resolve trigger from step 2, exiling Ugin's Nexus until your next upkeep.
Move to your extra turn.
At the beginning of your upkeep, Nahiri's Resolve triggers, returning Ugin's Nexus from exile to the battlefield.
Repeat.

Phyrexian Altar

Activate Xenic Poltergeist by tapping it, causing Ugin's Nexus to become an artifact creature until end of turn.
At the beginning of your end step, Athreos' second ability and Nahiri's Resolve trigger.
Resolve the Athreos trigger, putting a coin counter on Ugin's Nexus.
Holding priority, activate Krark-Clan Ironworks by sacrificing Ugin's Nexus, adding {C}{C}.
Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
Athreos' third ability triggers, causing you to return Ugin's Nexus from exile to the battlefield.
Resolve the Nahiri's Resolve trigger from step 2, exiling Ugin's Nexus until your next upkeep.
Move to your extra turn.
At the beginning of your upkeep, Nahiri's Resolve triggers, returning Ugin's Nexus from exile to the battlefield.
Repeat.

Krark-Clan Ironworks

Activate Karn by paying {1}, causing Ugin's Nexus to become an artifact creature until end of turn.
At the beginning of your end step, Athreos' second ability and Nahiri's Resolve trigger.
Resolve the Athreos trigger, putting a coin counter on Ugin's Nexus.
Holding priority, activate Phyrexian Altar by sacrificing Ugin's Nexus, adding one mana of any color.
Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
Athreos' third ability triggers, causing you to return Ugin's Nexus from exile to the battlefield.
Resolve the Nahiri's Resolve trigger from step 2, exiling Ugin's Nexus until your next upkeep.
Move to your extra turn.
At the beginning of your upkeep, Nahiri's Resolve triggers, returning Ugin's Nexus from exile to the battlefield.
Repeat.

Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Ugin's Nexus to become an artifact creature until end of turn.
At the beginning of your end step, Athreos' second ability and Nahiri's Resolve trigger.
Resolve the Athreos trigger, putting a coin counter on Ugin's Nexus.
Holding priority, activate Phyrexian Altar by sacrificing Ugin's Nexus, adding one mana of any color.
Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
Athreos' third ability triggers, causing you to return Ugin's Nexus from exile to the battlefield.
Resolve the Nahiri's Resolve trigger from step 2, exiling Ugin's Nexus until your next upkeep.
Move to your extra turn.
At the beginning of your upkeep, Nahiri's Resolve triggers, returning Ugin's Nexus from exile to the battlefield.
Repeat.

Activate Karn by paying {1}, causing Ugin's Nexus to become an artifact creature until end of turn.
At the beginning of your end step, Athreos' second ability and Nahiri's Resolve trigger.
Resolve the Athreos trigger, putting a coin counter on Ugin's Nexus.
Holding priority, activate Krark-Clan Ironworks by sacrificing Ugin's Nexus, adding {C}{C}.
Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
Athreos' third ability triggers, causing you to return Ugin's Nexus from exile to the battlefield.
Resolve the Nahiri's Resolve trigger from step 2, exiling Ugin's Nexus until your next upkeep.
Move to your extra turn.
At the beginning of your upkeep, Nahiri's Resolve triggers, returning Ugin's Nexus from exile to the battlefield.
Repeat.

Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Ugin's Nexus to become an artifact creature until end of turn.
At the beginning of your end step, Athreos' second ability and Nahiri's Resolve trigger.
Resolve the Athreos trigger, putting a coin counter on Ugin's Nexus.
Holding priority, activate Krark-Clan Ironworks by sacrificing Ugin's Nexus, adding {C}{C}.
Ugin's Nexus is exiled instead of being put into your graveyard, causing you to take an extra turn after this one.
Athreos' third ability triggers, causing you to return Ugin's Nexus from exile to the battlefield.
Resolve the Nahiri's Resolve trigger from step 2, exiling Ugin's Nexus until your next upkeep.
Move to your extra turn.
At the beginning of your upkeep, Nahiri's Resolve triggers, returning Ugin's Nexus from exile to the battlefield.
Repeat.

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