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

Prerequisites

• Archelos, Lagoon Mystic on the battlefield
• Zimone, Quandrix Prodigy on the battlefield
• Retreat to Coralhelm on the battlefield
• Guildless Commons in hand
• Zimone does not have summoning sickness
• Archelos is untapped
• 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. Guildless Commons enters the battlefield, triggering itself, Amulet of Vigor and Retreat to Coralhelm
3. 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