How can you create a combo with Trudge Garden, Intruder Alarm, Ajani's Welcome?
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[START OF COMBO]This combo can be formed with Trudge Garden, Intruder Alarm, Ajani's Welcome

Color identity: GWU
Mana cost: 
Steps:
  1. Gain any amount of life.
  2. Trudge Garden triggers, holding priority, activate all mana-producing creatures you control by tapping them, adding at least {3}.
  3. Resolve the Trudge Garden trigger, causing you to pay {2} to create a 4/4 Fungus Beast creature token.
  4. The Fungus Beast enters the battlefield, triggering Ajani's Welcome and Intruder Alarm.
  5. Resolve the Intruder Alarm trigger, untapping all creatures.
  6. Resolve the Ajani's Welcome trigger, causing you to gain 1 life.
  7. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite creature tokens
  - Infinite enters the battlefield
  - Infinite lifegain
  - Infinite lifegain triggers
  - 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
  - Creatures you control can tap to produce at least {3}.
  - You have a way to gain life.
[END OF COMBO PREREQUISITES]
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