Intruder Alarm + Maskwood Nexus + Xenic Poltergeist

UB identity

Commander legal

The 3 combo pieces

What must be in place

Maskwood Nexus and Xenic Poltergeist do not have summoning sickness.
Creatures you control can tap to produce at least {3}.

How to execute it

  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}.
  3. Activate Maskwood Nexus by paying {3} 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 {4}, this combo nets infinite mana.

What the combo produces