Intruder Alarm + Karn, the Great Creator + Maskwood Nexus

U identity

Commander legal

The 3 combo pieces

What must be in place

Creatures you control can tap to produce at least {3}.

How to execute it

  1. Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Maskwood Nexus to become a 4/4 artifact creature until end of turn.
  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