How can you create a combo with Intruder Alarm, Maskwood Nexus, Katsumasa, the Animator?
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[START OF COMBO]This combo can be formed with Intruder Alarm, Maskwood Nexus, Katsumasa, the Animator

Color identity: U
Mana cost: {2}{U}
Steps:
  1. Activate Katsumasa by paying {2}{U}, 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.[END OF COMBO STEPS]

Result:
  - Infinite creature tokens
  - Infinite enters the battlefield
  - Infinite mana creatures you control can produce
  - Infinite untap of all creatures[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Maskwood Nexus does not have summoning sickness.
  - Creatures you control can tap to produce at least {3}.
[END OF COMBO PREREQUISITES]
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