Dockside Extortionist, Umbral Mantle, and Splinter Twin

Prerequisites

• Dockside Extortionist on the battlefield
• Umbral Mantle on the battlefield
• Splinter Twin on the battlefield
• Splinter Twin and Umbral Mantle attached to Dockside Extortionist
• Dockside Extortionist does not have summoning sickness
• Opponents control at least four artifacts and/or enchantments

Steps

1. Activate Dockside Extortionist by tapping it, creating a token copy of itself with haste
2. The token Dockside Extortionist enters the battlefield, creating at least four Treasure tokens
3. Activate three Treasure tokens by tapping and sacrificing them, adding
4. Activate the nontoken Dockside Extortionist by paying and untapping it, giving itself +2/+2 until end of turn
5. Repeat

Results

• Infinite colored mana
• Infinite creature tokens with haste
• Infinite ETB
• Infinitely large Dockside Extortionist until end of turn
• Infinite Treasure tokens