Maester Seymour + Crystalline Crawler + Najeela, the Blade-Blossom

Prerequisites

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Steps

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

Effects

• Infinite +1/+1 counters on creatures you control
• Infinite colored mana
• Infinite combat phases