Gogo, Master of Mimicry, Vhal, Candlekeep Researcher, and Retreat to Coralhelm

Prerequisites

• Gogo, Master of Mimicry on the battlefield
• Vhal, Candlekeep Researcher on the battlefield
• Retreat to Coralhelm on the battlefield

Steps

1. Play any land, triggering Retreat to Coralhelm, targeting Gogo
2. Holding priority, activate Vhal by tapping it, adding at least that cannot be spent to cast spells from your hand
3. Activate Gogo by paying and tapping it, copying the Retreat to Coralhelm trigger, targeting Gogo and Vhal
4. Resolve both copies of the Retreat to Coralhelm abilities, untapping Gogo and Vhal
5. Repeat from step 2

Results

• Infinite untap of creatures you control
• Infinite mana creatures you control can produce
• Infinite colorless mana that cannot be spent to cast spells from your hand