Bright-Palm, Soul Awakener, Crystalline Crawler, and Hellkite Charger

Prerequisites

• Bright-Palm, Soul Awakener on the battlefield
• Crystalline Crawler on the battlefield
• Hellkite Charger on the battlefield
• Crystalline Crawler has at least eight +1/+1 counters on it
• Bright-Palm does not have summoning sickness
• Bright-Palm and Hellkite Charger cannot be blocked and killed by an opponent

Steps

1. Declare Bright-Palm and Hellkite Charger as attackers, triggering their abilities
2. Resolve the Bright-Palm trigger, doubling the number of +1/+1 counters on Crystalline Crawler
3. Activate Crystalline Crawler's first ability seven times by removing seven +1/+1 counters from it, adding
4. Resolve the Hellkite Charger trigger, causing you to pay to untap all attacking creatures you control and to get an additional combat phase after this one
5. Repeat

Results

• Infinite +1/+1 counter doubling
• Infinite colored mana
• Infinite combat phases