Springheart Nantuko + Overlord of the Hauntwoods + Spelunking + Exalted Sunborn

Springheart Nantuko

Overlord of the Hauntwoods

Spelunking

Exalted Sunborn

How it works

1. Declare Overlord of the Hauntwoods as an attacker.
2. Overlord of the Hauntwoods triggers, creating two untapped Everywhere land tokens due to Spelunking.
3. When the Everywhere tokens enter the battlefield, Springheart Nantuko triggers twice.
4. Holding priority, activate the Everywhere tokens by tapping them, adding 1.
5. Resolve the first Springheart Nantuko trigger, choosing not to pay and creating two 1/1 Insect creature tokens.
6. Resolve the second Springheart Nantuko trigger, causing you to pay 1 to create two token copies of Overlord of the Hauntwoods.
7. When the Overlord of the Hauntwoods tokens enters the battlefield, they trigger.
8. Resolve the first trigger, creating two untapped Everywhere land tokens due to Spelunking.
9. Repeat from step 3.

This loop gets its engine running when Overlord of the Hauntwoods attacks, generating land tokens that immediately enter untapped thanks to Spelunking's static ability. Because Exalted Sunborn is doubling every token creation event, those lands arrive in pairs and double your Springheart Nantuko landfall triggers. You can tap the generated Everywhere lands for mana to pay for Springheart Nantuko's optional landfall cost, which then uses Exalted Sunborn to churn out exponential waves of token copies of Overlord of the Hauntwoods. Every new token copy immediately restarts the cascade, flooding the battlefield with infinite mana, land tokens, and creatures.