Maester Seymour + Crystalline Crawler + Hellkite Charger

Prerequisites

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Steps

1. 1At the beginning of your combat phase, Maester Seymour triggers, putting at least seven +1/+1 counters on Crystalline Crawler.
2. 2Declare Hellkite Charger as an attacker, triggering its ability.
3. 3Holding priority, activate Crystalline Crawler's first ability seven times by removing seven +1/+1 counters from it, adding .
4. 4Resolve 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. 5Repeat.

Effects

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