How can you create a combo with Agatha's Soul Cauldron, Spike Feeder, Blood Researcher?
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[START OF COMBO]This combo can be formed with Agatha's Soul Cauldron, Spike Feeder, Blood Researcher

Color identity: BG
Mana cost: 
Steps:
  1. Activate Blood Researcher using Spike Feeder's second ability by removing a +1/+1 counter from it, causing you to gain 2 life.
  2. Blood Researcher triggers, putting a +1/+1 counter on it.
  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
  - Spike Feeder must be exiled
  - Blood Researcher must be on the battlefield
  - Blood Researcher has at least one +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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