Fertilid, Lotus Cobra, Felidar Retreat, and Archelos, Lagoon Mystic

Prerequisites

• Fertilid on the battlefield
• Lotus Cobra on the battlefield
• Felidar Retreat on the battlefield
• Archelos, Lagoon Mystic on the battlefield
• available

Steps

1. Activate Fertilid by paying and removing a +1/+1 counter from it, causing you to search your library for a basic land card and put it on the battlefield untapped due to Archelos
2. When the basic land enters, Lotus Cobra and Felidar Retreat trigger
3. Resolve the Lotus Cobra trigger, adding
4. Resolve the Felidar Retreat trigger, putting a +1/+1 counter on Fertilid
5. Activate the basic land by tapping it, adding
6. Repeat

Results

• Near-infinite landfall triggers
• Put all basic land cards from your library onto the battlefield tapped