How can you create a combo with Hakbal of the Surging Soul, Agatha's Soul Cauldron, Crystalline Crawler, Aggravated Assault?
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[START OF COMBO]This combo can be formed with Hakbal of the Surging Soul, Agatha's Soul Cauldron, Crystalline Crawler, Aggravated Assault

Color identity: GUR
Mana cost: 
Steps:
  1. At the beginning of your combat phase, Hakbal of the Surging Soul's first ability triggers, causing you to reveal the top card of your library, put a +1/+1 counter on each Merfolk you control and putting the card back on top of your library.
  2. Move to your postcombat main phase.
  3. Activate five Merfolk you control using Crystalline Crawler's first ability by removing a +1/+1 counter from each of them, adding {3}{R}{R}.
  4. Activate Aggravated Assault by paying {3}{R}{R}, causing you to untap all creatures you control and to get an additional combat phase after this one.
  5. Repeat.
  6. If you control six or more Merfolk, this combo nets infinite colored mana and +1/+1 counters on Merfolk you control.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters on each Merfolk you control
  - Infinite colored mana
  - Infinite combat phases
  - Infinite mana creatures you control can produce
  - Infinite untap of creatures you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Hakbal of the Surging Soul must be on the battlefield
  - Agatha's Soul Cauldron must be on the battlefield
  - Crystalline Crawler must be exiled
  - Aggravated Assault must be on the battlefield
  - You control at least five Merfolk.
  - You have a nonland card on top of your library.
[END OF COMBO PREREQUISITES]
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