How can you create a combo with Agatha's Soul Cauldron, Lurking Roper, Soulmender?
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[START OF COMBO]This combo can be formed with Agatha's Soul Cauldron, Lurking Roper, Soulmender

Color identity: GW
Mana cost: 
Steps:
  1. Activate Lurking Roper using Soulmender's ability by tapping it, causing you to gain 1 life.
  2. Lurking Roper triggers, untapping itself.
  3. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - Agatha's Soul Cauldron must be on the battlefield
  - Lurking Roper must be on the battlefield
  - Soulmender must be exiled
  - Lurking Roper has at least one +1/+1 counter on it and does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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