Quilled Greatwurm + Crystalline Crawler + Aggravated Assault

Quilled Greatwurm
Crystalline Crawler
Aggravated Assault

Requires
Quilled Greatwurm must be on the battlefield. Crystalline Crawler must be on the battlefield. Aggravated Assault must be on the battlefield. Crystalline Crawler has power 5 or greater, does not have summoning sickness, and cannot be blocked and killed by an opponent.
Steps
  1. Deal combat damage using Crystalline Crawler.
  2. Quilled Greatwurm triggers, putting that many +1/+1 counters on Crystalline Crawler.
  3. Move to your postcombat main phase.
  4. Activate Crystalline Crawler's first ability five times by removing five +1/+1 counters from it, adding 3.
  5. Activate Aggravated Assault by paying 3, untapping all creatures you control and causing you to get an additional combat and main phase after this one.
  6. Repeat.
Results
Infinite colored mana. Infinite combat phases. Infinite untap of creatures you control. Infinite mana creatures you control can produce. Infinite combat damage. Infinite +1/+1 counters on Crystalline Crawler.

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