Hakbal of the Surging Soul, Agatha's Soul Cauldron, Crystalline Crawler, and Aggravated Assault

Prerequisites

• Hakbal of the Surging Soul on the battlefield
• Agatha's Soul Cauldron on the battlefield
• Crystalline Crawler in exile
• Aggravated Assault on the battlefield
• You control at least five Merfolk
• You have a nonland card on top of your library

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
4. Activate Aggravated Assault by paying , 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

Results

• 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