Intruder Alarm, Maskwood Nexus, and Living Brain, Mechanical Marvel

Prerequisites

• Intruder Alarm on the battlefield
• Maskwood Nexus on the battlefield
• Living Brain, Mechanical Marvel on the battlefield

Steps

1. Animate Maskwood with Living Brain
2. Activate any number of mana-producing creatures you control by tapping them, adding at least
3. Activate Maskwood Nexus by paying and tapping it, creating a 2/2 Shapeshifter creature token
4. When the Shapeshifter enters the battlefield, Intruder Alarm triggers, untapping all creatures
5. Repeat from step 2
6. If creatures you control can tap to produce at least , this combo nets infinite mana

Results

• Infinite ETB
• Infinite creature tokens
• Infinite mana creatures you control can produce
• Infinite untap of creatures