How can you create a combo with Trench Behemoth, Fastbond, Thornwood Falls?
user
[START OF COMBO]This combo can be formed with Trench Behemoth, Fastbond, Thornwood Falls

Color identity: GU
Mana cost: 
Steps:
  1. Activate Trench Behemoth by returning Thornwood Falls from the battlefield to your hand, untapping it.
  2. Play Thornwood Falls, triggering it and Fastbond.
  3. Resolve the Thornwood Falls trigger, causing you to gain 1 life.
  4. Resolve the Fastbond trigger, dealing 1 damage to you.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite landfall triggers
  - Infinite lifegain triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
[END OF COMBO PREREQUISITES]
assistant