The Jolly Balloon Man, Agatha's Soul Cauldron, Midnight Guard, and Dockside Extortionist

Prerequisites

• The Jolly Balloon Man in exile
• Agatha's Soul Cauldron on the battlefield
• Midnight Guard on the battlefield
• Dockside Extortionist on the battlefield
• Midnight Guard has at least one +1/+1 counter on it
• Midnight Guard does not have summoning sickness
• Opponents control at least one artifact and/or enchantment
• available

Steps

1. Activate Midnight Guard using The Jolly Balloon Man's ability by paying and tapping it, creating a token copy of Dockside Extortionist that is a 1/1 Balloon with flying and haste in addition to its other types
2. When the Dockside Extortionist token enters the battlefield, it and Midnight Guard trigger
3. Resolve the Dockside Extortionist token's trigger, creating at least one Treasure token
4. Resolve the Midnight Guard trigger, untapping it
5. Activate a Treasure by tapping and sacrificing it, adding
6. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite creature tokens with haste
• Infinite token copies of each creature you control with haste except Midnight Guard
• Infinite colored mana
• Infinite Treasure tokens