Dockside Extortionist + Splinter Twin + Umbral Mantle

R identity

The 3 combo pieces

• Dockside Extortionist
• Splinter Twin
• Umbral Mantle

What must be in place

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.

How to execute it

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 {3}.
4. Activate the nontoken Dockside Extortionist by paying {3} and untapping it, giving itself +2/+2 until end of turn.
5. Repeat.

What the combo produces

• Infinite colored mana
• Infinite creature tokens with haste
• Infinite ETB
• Infinite mana creatures you control can produce
• Infinite Treasure tokens
• Infinite untap of creatures you control
• Infinitely large creature until end of turn