Activate Palladium Myr by tapping it, adding {C}{C}.
Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Magewright's Stone to become an artifact creature until end of turn.
Activate Illusionist's Bracers' equip ability by paying {3}, attaching it to Magewright's Stone.
Activate Magewright's Stone by paying {1} and tapping it, targeting itself.
Illusionist's Bracers triggers, copying Magewright's Stone abillity, targeting Palladium Myr.
Resolve both Magewright's Stone abilities, untapping Magewright's Stone and Palladium Myr.
Activate Palladium Myr by tapping it, adding {C}{C}.
Repeat from step 4.

Infinite colorless mana

Magewright's Stone

Illusionist's Bracers

Palladium Myr

Karn, the Great Creator

Activate Palladium Myr by tapping it, adding {C}{C}.
Activate Karn by paying {1}, causing Magewright's Stone to become an artifact creature until end of turn.
Activate Illusionist's Bracers' equip ability by paying {3}, attaching it to Magewright's Stone.
Activate Magewright's Stone by paying {1} and tapping it, targeting itself.
Illusionist's Bracers triggers, copying Magewright's Stone abillity, targeting Palladium Myr.
Resolve both Magewright's Stone abilities, untapping Magewright's Stone and Palladium Myr.
Activate Palladium Myr by tapping it, adding {C}{C}.
Repeat from step 4.

Karn, Silver Golem

Activate Chromatic Orrery's first ability by tapping it, adding {5}.
Activate Synod Artificer's second ability by paying {2} and tapping it, untapping Chromatic Orrery and Magewright's Stone.
Activate Magewright's Stone by paying {1} and tapping it, untapping Synod Artificer.
Repeat.
Once you have infinite mana, you may activate Chromatic Orrery's second ability instead to draw infinite cards.

Infinite card draw

Infinite colored mana

Infinite draw triggers

Infinite untap of noncreature artifacts you control

Synod Artificer

Chromatic Orrery

Activate Palladium Myr by tapping it, adding {C}{C}.
Activate Toymaker by paying {1}, tapping it and discarding a card, causing Magewright's Stone to become an artifact creature until end of turn.
Activate Illusionist's Bracers' equip ability by paying {3}, attaching it to Magewright's Stone.
Activate Magewright's Stone by paying {1} and tapping it, targeting itself.
Illusionist's Bracers triggers, copying Magewright's Stone abillity, targeting Palladium Myr.
Resolve both Magewright's Stone abilities, untapping Magewright's Stone and Palladium Myr.
Activate Palladium Myr by tapping it, adding {C}{C}.
Repeat from step 4.

Toymaker

Activate Empowered Autogenerator by tapping it, putting a charge counter on it and adding at least three mana of any color.
Activate Synod Artificer's second ability by paying {2} and tapping it, untapping Empowered Autogenerator and Magewright's Stone.
Activate Magewright's Stone by paying {1} and tapping it, untapping Synod Artificer.
Repeat.

Infinite charge counters on a permanent

Empowered Autogenerator

Activate Nyx Lotus by tapping it, adding at least four mana of any color with which you have devotion.
Activate Synod Artificer's second ability by paying {2} and tapping it, untapping Nyx Lotus and Magewright's Stone.
Activate Magewright's Stone by paying {1} and tapping it, untapping Synod Artificer.
Repeat.

Combos with "Magewright's Stone"