Maester Seymour, Crystalline Crawler, and Aggravated Assault

Prerequisites

• Maester Seymour on the battlefield
• Crystalline Crawler on the battlefield
• Aggravated Assault on the battlefield

Steps

1. At the beginning of your combat phase, Maester Seymour triggers, putting at least five +1/+1 counters on Crystalline Crawler
2. Move to your postcombat main phase
3. Activate Crystalline Crawler's first ability five times by removing five +1/+1 counters from it, adding
4. Activate Aggravated Assault by paying , untapping all creatures you control and causing you to get an additional combat and main phase after this one
5. Repeat

Results

• Infinite colored mana
• Infinite combat phases
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce
• Infinite +1/+1 counters