Mycosynth Lattice makes eveything an atrifact, Darksteel Forge makes all of your artifacts indestructible.
Nevinyrrall's Disk destroyes all artifacts except yours because yours are indestructable.
Unwinding Clock allows this to happen every untap step.

Destroy all opponent's permanents every turn

Nevinyrral's Disk

Darksteel Forge

Mycosynth Lattice

Unwinding Clock

Activate Kill Switch by paying {2} and tapping Kill Switch, tapping all other permanents.
Untap all permanents you control during each opponent's untap step due to Unwinding Clock.
The opponent's permanents do not untap during the untap step due to Kill Switch.
On each opponent's turn except the turn before yours in turn order, activate Kill Switch by paying {2} and tapping Kill Switch, tapping all other permanents.
Untap as normal on your untap step.
Repeat.

Permanents your opponents control do not untap

Kill Switch

Cast Emrakul by paying {13} reduced by its first ability.
Emrakul's second ability triggers, causing you to gain control of an opponent's next turn and giving them an additional turn after that one.
Move to that opponent's next turn.
Unwinding Clock triggers, untapping all artifacts you control.
Activate artifacts by tapping them to add enough mana to cast Emrakul, plus an additional {1}.
Activate Erratic Portal by paying {1} and tapping it, returning Emrakul from the battlefield to your hand.
Repeat until the opponent you are controlling each extra turn has lost the game.
Repeat for each remaining opponent.

Infinite turns for each opponent

You control your opponents on each of their turns

Emrakul, the Promised End

Erratic Portal

Vedalken Orrery

Cast Aeon Engine by paying {5}.
Aeon Engine enters the battlefield, triggering Mirrorworks, causing you to pay {2} to create a copy of Aeon Engine.
Activate Master Transmuter by paying {U} and tapping it, returning Aeon Engine to your hand.
Pass the turn.
Untap all permanents you control during each opponent's untap step due to Unwinding Clock.
Activate the token copy of Aeon Engine by tapping and exiling it, reversing the game order.
On your turn, repeat from step 1.

Locks out all of your opponents but one, and allows you to choose which of your two neighboring opponents get to have turns

Aeon Engine

Master Transmuter

Mirrorworks

Activate any number of permanents by tapping them, adding at least {4}.
Activate Mindslaver by paying {4}, tapping and sacrificing it, causing you to gain control of the next person in turn order.
Move to the next turn. During that turn's untap step, untap all permanents you control due to Unwinding Clock and Mycosynth Lattice.
Activate Trasnsmutation Font by tapping it, creating an artifact token.
Activate Goblin Welder by tapping it, causing you to sacrifice the artifact token and return Mindslaver from your graveyard to the battlefield.
Repeat as long as you aren't next in turn order.

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