Quandrix Command, Crystalline Crawler, Lutri, the Spellchaser, and Shang-Chi, Martial Mentor

Prerequisites

• Quandrix Command in hand
• Crystalline Crawler on the battlefield
• Lutri, the Spellchaser in hand
• Shang-Chi, Martial Mentor on the battlefield
• available

Steps

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

Results

• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers
• Infinite storm count