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 Spelunking.
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 creature ETB

Infinite creature tokens

Infinite landfall triggers

Infinite tapped Mutavault land tokens

Infinite card draw

Infinite draw triggers

Springheart Nantuko

Mutable Explorer

Spelunking

Lotus Cobra

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 colorless mana

Infinite Mutavault land tokens

Parallel Lives

Tireless Provisioner

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 Lotus Cobra trigger.
Resolve the Amulet of Vigor trigger, untapping the Mutavault token.
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.

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 Lotus Cobra trigger.
Resolve the Lotus Cobra trigger, adding {G}.
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.

Squandered Resources

Activate Emiel the Blessed by paying {3}, blinking Mutable Explorer.
When Mutable Explorer enters, it triggers, creating an untapped Mutavault land token due to Spelunking.
Activate the Mutavault token by tapping it, adding {C}{C}{C} due to Nyxbloom Ancient.
Repeat.

Infinite creature LTB

Infinite tapped Forest tokens

Infinite tapped Island tokens

Infinite tapped Mountain tokens

Infinite tapped Plains tokens

Infinite tapped Swamp tokens

Infinite tapped copies of a specific land

Emiel the Blessed

Nyxbloom Ancient

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.

Infinite tapped creature tokens

Earthcraft

Cast Mutable Explorer by paying {2}{G}.
When Mutable Explorer enters the battlefield, it triggers, creating a tapped Mutavault land token.
When the Mutavault token enters the battlefield, Nissa and Retreat to Coralhelm trigger.
Reoslve the Nissa trigger, adding {1}.
Resolve the Retreat to Coralhelm trigger, untapping Romana II.
Activate Romana II by paying {1} and tapping it, creating a tapped copy of the Mutavault token.
Repeat from step 3.

Romana II

Retreat to Coralhelm

Nissa, Resurgent Animist

Cast Mutable Explorer by paying {2}{G}.
When Mutable Explorer enters the battlefield, it triggers, creating a tapped Mutavault land token.
When the Mutavault token enters the battlefield, Tiller Engine and Retreat to Coralhelm trigger.
Reoslve the Tiller Engine trigger, untapping the Mutavault token.
Resolve the Retreat to Coralhelm trigger, untapping Romana II.
Activate the Mutavault token by tapping it, adding {C}.
Activate Romana II by paying {1} and tapping it, creating a tapped copy of the Mutavault token.
Repeat from step 3.

Combos with "Mutable Explorer"