If Karn has exactly one loyalty counter on it, activate its first loyalty ability by putting a loyalty counter on it.
Activate Krark-Clan Ironworks by sacrificing Ugin's Nexus. Ugin's Nexus will be exiled instead of being put into your graveyard due to its replacement effect, causing you to take an extra turn after this one.
Move to your next turn.
Activate Aetheric Amplifier by paying {4} and tapping it, doubling the number of counters on Karn.
Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
Cast Ugin's Nexus by paying {5}.
Repeat from step 2.

Infinite turns

Lock

Ugin's Nexus

Aetheric Amplifier

Karn, the Great Creator

Krark-Clan Ironworks

If Karn has exactly one loyalty counter on it, activate its first loyalty ability by putting a loyalty counter on it.
Activate Grinding Station by sacrificing Ugin's Nexus. Ugin's Nexus will be exiled instead of being put into your graveyard due to its replacement effect, causing you to take an extra turn after this one.
Move to your next turn.
Activate Aetheric Amplifier by paying {4} and tapping it, doubling the number of counters on Karn.
Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
Cast Ugin's Nexus by paying {5}.
Repeat from step 2.

Grinding Station

If Karn has exactly one loyalty counter on it, activate its first loyalty ability by putting a loyalty counter on it.
Activate Arcbound Ravager by sacrificing Ugin's Nexus. Ugin's Nexus will be exiled instead of being put into your graveyard due to its replacement effect, causing you to take an extra turn after this one.
Move to your next turn.
Activate Aetheric Amplifier by paying {4} and tapping it, doubling the number of counters on Karn.
Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
Cast Ugin's Nexus by paying {5}.
Repeat from step 2.

Arcbound Ravager

If Karn has exactly one loyalty counter on it, activate its first loyalty ability by putting a loyalty counter on it.
Activate Extruder by sacrificing Ugin's Nexus. Ugin's Nexus will be exiled instead of being put into your graveyard due to its replacement effect, causing you to take an extra turn after this one.
Move to your next turn.
Activate Aetheric Amplifier by paying {4} and tapping it, doubling the number of counters on Karn.
Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
Cast Ugin's Nexus by paying {5}.
Repeat from step 2.

Extruder

If Karn has exactly one loyalty counter on it, activate its first loyalty ability by putting a loyalty counter on it.
Activate Hammerhead by sacrificing Ugin's Nexus. Ugin's Nexus will be exiled instead of being put into your graveyard due to its replacement effect, causing you to take an extra turn after this one.
Move to your next turn.
Activate Aetheric Amplifier by paying {4} and tapping it, doubling the number of counters on Karn.
Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
Cast Ugin's Nexus by paying {5}.
Repeat from step 2.

Hammerhead, Maggia Boss

If Karn has exactly one loyalty counter on it, activate its first loyalty ability by putting a loyalty counter on it.
Activate Umbral Collar Zealot by sacrificing Ugin's Nexus. Ugin's Nexus will be exiled instead of being put into your graveyard due to its replacement effect, causing you to take an extra turn after this one.
Move to your next turn.
Activate Aetheric Amplifier by paying {4} and tapping it, doubling the number of counters on Karn.
Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
Cast Ugin's Nexus by paying {5}.
Repeat from step 2.

Umbral Collar Zealot

If Karn has exactly one loyalty counter on it, activate its first loyalty ability by putting a loyalty counter on it.
Activate Phantom Train by sacrificing Ugin's Nexus. Ugin's Nexus will be exiled instead of being put into your graveyard due to its replacement effect, causing you to take an extra turn after this one.
Move to your next turn.
Activate Aetheric Amplifier by paying {4} and tapping it, doubling the number of counters on Karn.
Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
Cast Ugin's Nexus by paying {5}.
Repeat from step 2.

Phantom Train

If Karn has exactly one loyalty counter on it, activate its first loyalty ability by putting a loyalty counter on it.
Activate Ravenous Intruder by sacrificing Ugin's Nexus. Ugin's Nexus will be exiled instead of being put into your graveyard due to its replacement effect, causing you to take an extra turn after this one.
Move to your next turn.
Activate Aetheric Amplifier by paying {4} and tapping it, doubling the number of counters on Karn.
Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
Cast Ugin's Nexus by paying {5}.
Repeat from step 2.

Ravenous Intruder

If Karn has exactly one loyalty counter on it, activate its first loyalty ability by putting a loyalty counter on it.
Activate Megatog by sacrificing Ugin's Nexus. Ugin's Nexus will be exiled instead of being put into your graveyard due to its replacement effect, causing you to take an extra turn after this one.
Move to your next turn.
Activate Aetheric Amplifier by paying {4} and tapping it, doubling the number of counters on Karn.
Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
Cast Ugin's Nexus by paying {5}.
Repeat from step 2.

Megatog

If Karn has exactly one loyalty counter on it, activate its first loyalty ability by putting a loyalty counter on it.
Activate Krark-Clan Grunt by sacrificing Ugin's Nexus. Ugin's Nexus will be exiled instead of being put into your graveyard due to its replacement effect, causing you to take an extra turn after this one.
Move to your next turn.
Activate Aetheric Amplifier by paying {4} and tapping it, doubling the number of counters on Karn.
Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
Cast Ugin's Nexus by paying {5}.
Repeat from step 2.

Krark-Clan Grunt

If Karn has exactly one loyalty counter on it, activate its first loyalty ability by putting a loyalty counter on it.
Activate Atog by sacrificing Ugin's Nexus. Ugin's Nexus will be exiled instead of being put into your graveyard due to its replacement effect, causing you to take an extra turn after this one.
Move to your next turn.
Activate Aetheric Amplifier by paying {4} and tapping it, doubling the number of counters on Karn.
Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
Cast Ugin's Nexus by paying {5}.
Repeat from step 2.

Atog

If Karn has exactly one loyalty counter on it, activate its first loyalty ability by putting a loyalty counter on it.
Activate Evereth by sacrificing Ugin's Nexus. Ugin's Nexus will be exiled instead of being put into your graveyard due to its replacement effect, causing you to take an extra turn after this one.
Move to your next turn.
Activate Aetheric Amplifier by paying {4} and tapping it, doubling the number of counters on Karn.
Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
Cast Ugin's Nexus by paying {5}.
Repeat from step 2.

Evereth, Viceroy of Plunder

If Karn has exactly one loyalty counter on it, activate its first loyalty ability by putting a loyalty counter on it.
Activate Lithatog by sacrificing Ugin's Nexus. Ugin's Nexus will be exiled instead of being put into your graveyard due to its replacement effect, causing you to take an extra turn after this one.
Move to your next turn.
Activate Aetheric Amplifier by paying {4} and tapping it, doubling the number of counters on Karn.
Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
Cast Ugin's Nexus by paying {5}.
Repeat from step 2.

Lithatog

If Karn has exactly one loyalty counter on it, activate its first loyalty ability by putting a loyalty counter on it.
Activate Bartolomé del Presidio by sacrificing Ugin's Nexus. Ugin's Nexus will be exiled instead of being put into your graveyard due to its replacement effect, causing you to take an extra turn after this one.
Move to your next turn.
Activate Aetheric Amplifier by paying {4} and tapping it, doubling the number of counters on Karn.
Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
Cast Ugin's Nexus by paying {5}.
Repeat from step 2.

Bartolomé del Presidio

If Karn has exactly one loyalty counter on it, activate its first loyalty ability by putting a loyalty counter on it.
Activate Sarcatog by sacrificing Ugin's Nexus. Ugin's Nexus will be exiled instead of being put into your graveyard due to its replacement effect, causing you to take an extra turn after this one.
Move to your next turn.
Activate Aetheric Amplifier by paying {4} and tapping it, doubling the number of counters on Karn.
Activate Karn's second loyalty ability by removing two loyalty counters from it, returning Ugin's Nexus from exile to your hand.
Cast Ugin's Nexus by paying {5}.
Repeat from step 2.

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