Activate Marwyn by tapping it, adding at least seven {G}.
Cast Emerald Charm by paying {G}, untapping Marwyn.
Activate Temur Sabertooth by paying {1}{G}, returning Eternal Witness from the battlefield to your hand.
Cast Eternal Witness by paying {1}{G}{G}.
Eternal Witness enters the battlefield, returning Emerald Charm from your graveyard to your hand.
Repeat.

Infinite blinking of some creatures

Infinite creature ETB

Infinite green mana

Infinite creature LTB

Infinite magecraft triggers

Infinite mana creatures you control can produce

Infinite storm count

Infinite untap of creatures you control

Marwyn, the Nurturer

Eternal Witness

Temur Sabertooth

Emerald Charm

Activate Marwyn by tapping it, adding at least eight {G}.
Cast Emerald Charm by paying {G}, untapping Marwyn.
Activate Temur Sabertooth by paying {1}{G}, returning Timeless Witness from the battlefield to your hand.
Cast Timeless Witness by paying {2}{G}{G}.
Timeless Witness enters the battlefield, returning Emerald Charm from your graveyard to your hand.
Repeat.

Timeless Witness

Cast Emerald Charm by paying {G}, targeting any permanent.
Storm-Kiln Artist triggers, creating a Treasure token.
Activate the Treasure by tapping and sacrificing it, adding {R}.
Activate the creature with Dual Casting attached by paying {R} and tapping it, copying Emerald Charm, targeting the creature with Dual Casting attached.
Storm-Kiln Artist triggers, creating a Treasure token.
Resolve the copy of Emerald Charm, untapping the creature with Dual Casting attached.
Repeat from step 3.

Infinite artifact ETB

Infinite artifact LTB

Storm-Kiln Artist

Dual Casting

Activate a permanent you control by tapping it, adding at least {3}.
Activate Isochron Scepter by paying {2} and tapping it, casting a copy of Emerald Charm without paying its mana cost, targeting Isochron Scepter.
Swarm Intelligence triggers, creating a copy of Emerald Charm, targeting the permanent that can tap to produce at least {3}.
Resolve both Emerald Charm copies, untapping Isochron Scepter and the permanent.
Repeat.

Infinite mana permanents you control can produce

Isochron Scepter

Swarm Intelligence

Activate Basalt Monolith's first ability by tapping it, adding {C}{C}{C}.
Activate Isochron Scepter by paying {2} and tapping it, casting a copy of Emerald Charm without paying its mana cost, targeting Isochron Scepter.
Swarm Intelligence triggers, creating a copy of Emerald Charm, targeting Basalt Monolith.
Resolve both Emerald Charms, untapping Isochron Scepter and Basalt Monolith.
Repeat.

Basalt Monolith

Activate Lotus Field by tapping it, adding three mana of any color.
Activate Isochron Scepter by paying {2} and tapping it, casting a copy of Emerald Charm without paying its mana cost, targeting Isochron Scepter.
Swarm Intelligence triggers, creating a copy of Emerald Charm, targeting Lotus Field.
Resolve both Emerald Charms, untapping Isochron Scepter and Lotus Field.
Repeat.

Lotus Field

Activate Lotus Field by tapping it, adding three mana of any color.
Activate Isochron Scepter by paying {2} and tapping it, casting a copy of Emerald Charm without paying its mana cost, targeting Isochron Scepter.
Chandra and Displacer Kitten trigger.
Resolve the Displacer Kitten trigger, blinking Chandra.
Resolve the Chandra trigger, creating a copy of Emerald Charm, targeting Lotus Field.
Resolve both Emerald Charms, untapping Isochron Scepter and Lotus Field.
Repeat.

Combos with "Emerald Charm"