Play a land.
When the land enters, Springheart Nantuko triggers, causing you to pay {1}{G} to create two token copies of Mutable Explorer.
When the Mutable Explorer tokens enter, they trigger.
Resolve the first Mutable Explorer trigger, creating two Mutavault land tokens that enters tapped.
When the Mutavault tokens enter, Springheart Nantuko and Tireless Provisioner each trigger twice.
Resolve the Tireless Provisioner triggers, creating two Treasure tokens.
Holding priority, activate the Treasures by tapping and sacrificing them, adding {1}{G}.
Resolve the Springheart Nantuko trigger, causing you to pay {1}{G} to create two token copies of Mutable Explorer.
Repeat from step 3.

Infinite ETB

Infinite colorless mana

Infinite creature tokens

Infinite landfall triggers

Infinite Mutavault land tokens

Springheart Nantuko

Mutable Explorer

Tireless Provisioner

Parallel Lives

Play a land.
When the land enters, Springheart Nantuko triggers, causing you to pay {1}{G} to create a token copy of Mutable Explorer.
When the Mutable Explorer token enters, it triggers, creating a Mutavault land token that enters untapped due to Horizon Explorer.
When the Mutavault token enters, Springheart Nantuko and Lotus Cobra trigger.
Holding priority, activate the Mutavault token by tapping it, adding {C}.
Resolve the Lotus Cobra trigger, adding {G}.
Resolve the Springheart Nantuko trigger, causing you to pay {1}{G} to create a token copy of Mutable Explorer.
Repeat from step 3.

Infinite tapped Mutavault land tokens

Horizon Explorer

Lotus Cobra

Play a land.
When the land enters, Springheart Nantuko triggers, causing you to pay {1}{G} to create a token copy of Mutable Explorer.
When the Mutable Explorer token enters, it triggers, creating a Mutavault land token that enters tapped.
When the Mutavault token enters, Springheart Nantuko, Amulet of Vigor and Tireless Provisioner trigger.
Resolve the Amulet of Vigor trigger, untapping the Mutavault token.
Holding priority, activate the Mutavault token by tapping it, adding {C}.
Resolve the Tireless Provisioner trigger, creating a Treasure token.
Holding priority, activate the Treasure by tapping and sacrificing it, adding {G}.
Resolve the Springheart Nantuko trigger, causing you to pay {1}{G} to create a token copy of Mutable Explorer.
Repeat from step 3.

Amulet of Vigor

Play a land.
When the land enters, Springheart Nantuko triggers, causing you to pay {1}{G} to create a token copy of Mutable Explorer.
When the Mutable Explorer token enters, it triggers, creating a Mutavault land token that enters tapped.
When the Mutavault token enters, Springheart Nantuko and Tireless Provisioner trigger.
Resolve the Tireless Provisioner trigger, creating a Treasure token.
Holding priority, activate Squandered Resources by sacrificing the Mutavault token, adding {C}.
Activate the Treasure by tapping and sacrificing it, adding {G}.
Resolve the Springheart Nantuko trigger, causing you to pay {1}{G} to create two token copies of Mutable Explorer.
Repeat from step 3.

Squandered Resources

Play a land.
When the land enters, Springheart Nantuko triggers, causing you to pay {1}{G} to create a token copy of Mutable Explorer.
When the Mutable Explorer token enters, it trigger.
Holding priority, activate Earthcraft by tapping the Mutable Explorer token, untapping a basic Forest.
Activate the Forest by tapping it, adding {G}.
Resolve the Mutable Explorer trigger, creating a Mutavault land token that enters tapped.
When the Mutavault token enters, Springheart Nantuko triggers.
Holding priority, activate Squandered Resources by sacrificing the Mutavault token, adding {C}.
Resolve the Springheart Nantuko trigger, causing you to pay {1}{G} to create two token copies of Mutable Explorer.
Repeat from step 3.

Combos with "Mutable Explorer"