Intruder Alarm + Maskwood Nexus + Toymaker

Intruder Alarm
Maskwood Nexus
Toymaker

Requires
Intruder Alarm must be on the battlefield. Maskwood Nexus must be on the battlefield. Toymaker must be on the battlefield. Toymaker does not have summoning sickness. You have at least one card in hand. Maskwood Nexus does not have summoning sickness. Creatures you control can tap to produce at least 3.
Steps
  1. Activate Toymaker by paying 1, tapping it and discarding a card, causing Maskwood Nexus to become an 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.
Results
Infinite ETB. Infinite creature tokens. Infinite untap of all creatures. Infinite mana creatures you control can produce.

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