Isochron Scepter + Pull from Eternity + Kess, Dissident Mage + Karn's Temporal Sundering

Isochron Scepter

Pull from Eternity

Kess, Dissident Mage

Karn's Temporal Sundering

How it works

1. Cast Karn's Temporal Sundering by paying 4, causing you to take an extra turn after this one and exile Karn's Temporal Sundering.
2. Activate Isochron Scepter by paying 2 and tapping it, casting a copy of Pull from Eternity without paying its mana cost.
3. Resolve Pull from Eternity, putting Karn's Temporal Sundering into your graveyard from exile.
4. Move to your next turn.
5. Cast Karn's Temporal Sundering from your graveyard by paying 4, causing you to take an extra turn after this one and exile Karn's Temporal Sundering.
6. Repeat from step 2.

This engine turns time itself into an infinite loop by weaponizing exile as a resource. After casting Karn's Temporal Sundering for its heavy mana cost—legally permitted by having Kess, Dissident Mage on the board as your required legendary creature—the sorcery naturally exiles itself upon resolution. From there, Isochron Scepter steps in by holding a copy of Pull from Eternity, allowing you to continually fish that exiled sorcery back out of exile and into your graveyard. Finally, Kess, Dissident Mage grants you permission to replay Karn's Temporal Sundering straight from your graveyard on your next turn, leaving you free to repeat the entire sequence indefinitely for infinite turns.