Zimone, Quandrix Prodigy, Retreat to Coralhelm, Stone-Seeder Hierophant, and Rakdos Carnarium

Prerequisites

• Zimone, Quandrix Prodigy on the battlefield
• Retreat to Coralhelm on the battlefield
• Stone-Seeder Hierophant on the battlefield
• Rakdos Carnarium in hand
• available

Steps

1. Activate Zimone's first ability by paying and tapping it, putting Rakdos Carnarium from your hand onto the battlefield
2. When Rakdos Carnarium enters the battlefield, it, Retreat to Coralhelm and Stone-Seeder Hierophant trigger Resolve the Stone-Seeder Hierophant trigger, untapping it
3. Holding priority, activate Stone-Seeder Hierophant by tapping it, untapping Rakdos Carnarium
4. Activate Rakdos Carnarium by tapping it, adding
5. Resolve the Rakdos Carnarium trigger from step 2, returning it from the battlefield to your hand
6. Resolve the Retreat to Coralhelm trigger, untapping Zimone
7. Repeat

Results

• Infinite landfall triggers
• Infinite red mana
• Infinite mana lands you control can produce
• Infinite black mana
• Infinite untap of lands you control