Springheart Nantuko + Mutable Explorer + Lotus Cobra + Exalted Sunborn

Springheart Nantuko

Mutable Explorer

Lotus Cobra

Exalted Sunborn

How it works

1. Play a land.
2. When the land enters, Springheart Nantuko triggers, causing you to pay 1 to create two token copies of Mutable Explorer.
3. When the Mutable Explorer tokens enter, they trigger.
4. Resolve the first Mutable Explorer trigger, creating two Mutavault land tokens that enters tapped.
5. When the Mutavault tokens enter, Springheart Nantuko and Lotus Cobra each trigger twice.
6. Resolve the Lotus Cobra triggers, adding 1.
7. Resolve the Springheart Nantuko trigger, causing you to pay 1 to create two token copies of Mutable Explorer.
8. Repeat from step 3.

This intricate loop turns a simple land drop into an engine of endless replication by feeding its own landfall triggers back into itself. With Exalted Sunborn doubling every token created, the initial copy of Mutable Explorer and its subsequent iterations scale exponentially, generating a mountain of Mutavault tokens that enter tapped. Meanwhile, Lotus Cobra converts those very same land drops into the exact green and colorless mana needed to fuel Springheart Nantuko's landfall ability, which continuously bestows fresh copies of Mutable Explorer onto the battlefield.