Activate Krark-Clan Ironworks by sacrificing Sword of the Meek, adding {C}{C}.
Skittering Precursor triggers, creating a 0/1 Eldrazi Spawn creature token.
When the Eldrazi Spawn enters the battlefield as a 1/1 due to Nahiri's Resolve, Sword of the Meek triggers, returning Sword of the Meek from your graveyard to the battlefield attached to the Eldrazi Spawn.
Repeat.

Infinite LTB

Infinite ETB

Infinite sacrifice triggers

Infinite death triggers

Infinite colorless mana

Infinite creature tokens

Skittering Precursor

Sword of the Meek

Nahiri's Resolve

Krark-Clan Ironworks

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.

Infinite turns

Athreos, Shroud-Veiled

Ugin's Nexus

Karn, the Great Creator

Phyrexian Altar

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.

Ashnod's Altar

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.

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.

Karn, Silver Golem

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.

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 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.

Xenic Poltergeist

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.

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.

Combos with "Nahiri's Resolve"