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

Color identity: UBRG
Mana cost: 
Steps:
  1. Activate Trench Behemoth by returning Bloodfell Caves from the battlefield to your hand, untapping it.
  2. Play Bloodfell Caves, triggering it and Fastbond.
  3. Resolve the Bloodfell Caves 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]
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