Zimone, Quandrix Prodigy, Retreat to Coralhelm, Archelos, Lagoon Mystic, and Guildless Commons

Prerequisites

• Zimone, Quandrix Prodigy on the battlefield
• Retreat to Coralhelm on the battlefield
• Archelos, Lagoon Mystic on the battlefield
• Guildless Commons in hand
• available

Steps

1. Activate Zimone's first ability by paying and tapping it, putting Guildless Commons from your hand onto the battlefield untapped due to Archelos
2. When Guildless Commons enters the battlefield, it and Retreat to Coralhelm trigger
3. Holding priority, activate Guildless Commons by tapping it, adding
4. Resolve the Guildless Commons 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 colorless mana
• Infinite landfall triggers