Intruder Alarm, Maskwood Nexus, and Xenic Poltergeist

Prerequisites

• Intruder Alarm on the battlefield
• Maskwood Nexus on the battlefield
• Xenic Poltergeist on the battlefield
• Maskwood Nexus and Xenic Poltergeist do not have summoning sickness
• Creatures you control can tap to produce at least

Steps

1. Activate Xenic Poltergeist by tapping it, causing Maskwood Nexus to become an artifact creature until your next upkeep
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 untap of all creatures
• Infinite mana creatures you control can produce