How can you create a combo with Evolution Witness, Agatha's Soul Cauldron, Psychic Frog?
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[START OF COMBO]This combo can be formed with Evolution Witness, Agatha's Soul Cauldron, Psychic Frog

Color identity: BGU
Mana cost: 
Steps:
  1. Activate Evolution Witness using Psychic Frog's first ability by discarding a permanent card, putting a +1/+1 counter on Evolution Witness.
  2. Evolution Witness triggers, returning the permanent card from your graveyard to your hand.
  3. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters on Evolution Witness
  - Infinite self-discard triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Evolution Witness must be on the battlefield
  - Agatha's Soul Cauldron must be on the battlefield
  - Psychic Frog must be exiled
  - You have at least one permanent card in hand.
  - Evolution Witness has at least one +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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