Zimone, Quandrix Prodigy, Retreat to Coralhelm, Spelunking, and Boros Garrison

Prerequisites

• Zimone, Quandrix Prodigy on the battlefield
• Retreat to Coralhelm on the battlefield
• Spelunking on the battlefield
• Boros Garrison in hand
• available

Steps

1. Activate Zimone's first ability by paying and tapping it, putting Boros Garrison from your hand onto the battlefield untapped due to Spelunking
2. When Boros Garrison enters the battlefield, it and Retreat to Coralhelm trigger
3. Holding priority, activate Boros Garrison by tapping it, adding
4. Resolve the Boros Garrison trigger from step 2, returning itself from the battlefield to your hand
5. Resolve the Retreat to Coralhelm trigger, untapping Zimone
6. Repeat

Results

• Infinite red mana
• Infinite landfall triggers
• Infinite white mana