How can you create a combo with Animation Module, Intruder Alarm, First Day of Class?
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[START OF COMBO]This combo can be formed with Animation Module, Intruder Alarm, First Day of Class

Color identity: UR
Mana cost: {1}{R}
Steps:
  1. Cast First Day of Class by paying {1}{R}.
  2. Cause a creature to enter the battlefield.
  3. When the creature enters the battlefield, Intruder Alarm and First Day of Class trigger.
  4. Resolve the Intruder Alarm trigger, untapping all creatures.
  5. Holding priority, activate a mana-producing creature by tapping it, adding at least {1}.
  6. Resolve the First Day of Class trigger, putting a +1/+1 counter on the creature that entered the battlefield and giving it haste until end of turn.
  7. Animation Module triggers, causing you to create a 1/1 Servo artifact creature token.
  8. Repeat from step 3.[END OF COMBO STEPS]

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

Other prerequisites:
  - Animation Module must be on the battlefield
  - Intruder Alarm must be on the battlefield
  - First Day of Class must be in your hand
  - Creatures you control can tap to produce at least {1}.
  - You have a way to cause a creature to enter the battlefield without a -1/-1 counter on it.
[END OF COMBO PREREQUISITES]
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