Springheart Nantuko, Overlord of the Hauntwoods, Elspeth, Storm Slayer, and Horizon Explorer

Prerequisites

• Springheart Nantuko on the battlefield
• Overlord of the Hauntwoods on the battlefield
• Elspeth, Storm Slayer on the battlefield
• Horizon Explorer on the battlefield

Steps

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

Results

• Infinite ETB
• Infinite colored mana
• Infinite creature tokens
• Infinite landfall triggers
• Infinite Forest tokens
• Infinite Everywhere land tokens
• Infinite Plains tokens
• Infinite Island tokens
• Infinite Mountain tokens
• Infinite Swamp tokens