Ancient Greenwarden, Mina and Denn, Wildborn, Nissa, Resurgent Animist, Retreat to Coralhelm, and Scaled Herbalist

Prerequisites

• Ancient Greenwarden on the battlefield
• Mina and Denn, Wildborn on the battlefield
• Nissa, Resurgent Animist on the battlefield
• Retreat to Coralhelm on the battlefield
• Scaled Herbalist on the battlefield
• You have a land card in hand
• Scaled Herbalist does not have summoning sickness

Steps

1. Activate Scaled Herbalist by tapping it, putting a land from your hand onto the battlefield
2. The land enters the battlefield, triggering Nissa and Retreat to Coralhelm twice
3. Resolve both Nissa triggers, adding
4. Resolve the first Retreat to Coralhelm trigger, causing you to either tap or untap a creature, or scry 1
5. Resolve the second Retreat to Coralhelm trigger, untapping Scaled Herbalist
6. Activate Mina and Denn by paying and returning the land from the battlefield to your hand, giving target creature trample until end of turn
7. Repeat

Results

• Infinite landfall triggers
• Infinite mana creatures you control can produce
• Infinite scry 1
• Infinite untap of creatures you control