Quandrix Command + Crystalline Crawler + Dualcaster Mage + The Earth Crystal

Quandrix Command

Crystalline Crawler

Dualcaster Mage

The Earth Crystal

How it works

1. Cast Quandrix Command by paying its mana cost, choosing its first and third modes.
2. Holding priority, cast Dualcaster Mage by paying its mana cost.
3. When Dualcaster Mage enters, it triggers, copying Quandrix Command, with the copy's first mode targeting Dualcaster Mage and the copy's third mode targeting Crystalline Crawler.
4. Resolve the copy of Quandrix Command, returning Dualcaster Mage from the battlefield to your hand and putting four +1/+1 counters on Crystalline Crawler due to The Earth Crystal.
5. Holding priority, activate Crystalline Crawler three times by removing three +1/+1 counters from it, adding 1.
6. Repeat from step 2.

This clever loop uses Dualcaster Mage to endlessly copy Quandrix Command, creating an engine that bounces and re-casts the Mage while continuously fueling your mana pool. Crystalline Crawler acts as the ultimate battery for this cycle, sacrificing the +1/+1 counters it accumulates to pay for Dualcaster Mage's re-casting costs. Meanwhile, The Earth Crystal supercharges this growth by doubling every counter placed on the Crawler, ensuring you always have plenty of counters to strip for mana.