Najeela, the Blade-Blossom, Bright-Palm, Soul Awakener, and Crystalline Crawler

Prerequisites

• Najeela, the Blade-Blossom on the battlefield
• Bright-Palm, Soul Awakener on the battlefield
• Crystalline Crawler on the battlefield
• Crystalline Crawler has at least six +1/+1 counters on it
• Bright-Palm and Najeela do not have summoning sickness and cannot be blocked and killed by an opponent

Steps

1. Declare Bright-Palm and Najeela 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 five times by removing five +1/+1 counters from it, adding
4. Resolve the Najeela trigger, creating a 1/1 Warrior creature token that is tapped and attacking
5. Activate Najeela by paying , untapping all attacking creatures, giving them trample, lifelink and haste, and gaining an additional combat phase after this one
6. Repeat

Results

• Infinite +1/+1 counter doubling
• Infinite colored mana
• Infinite combat phases
• Infinite creature tokens
• Infinite lifegain
• Infinite lifegain triggers