Crystalline Crawler + Hellkite Charger + Maester Seymour

RG identity

Commander legal

The 3 combo pieces

• Crystalline Crawler
• Hellkite Charger
• Maester Seymour

How to execute it

1. At the beginning of your combat phase, Maester Seymour triggers, putting at least seven +1/+1 counters on Crystalline Crawler.
2. Declare Hellkite Charger as an attacker, triggering its ability.
3. Holding priority, activate Crystalline Crawler's first ability seven times by removing seven +1/+1 counters from it, adding {5}{R}{R}.
4. Resolve the Hellkite Charger trigger, causing you to pay {5}{R}{R} to untap all attacking creatures you control and to get an additional combat phase after this one.
5. Repeat.

What the combo produces

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