Baral's Expertise, and Lutri, the Spellchaser

Prerequisites

• Baral's Expertise in hand
• Lutri, the Spellchaser in hand or in the command zone
• plus commander tax if applicable available

Steps

1. Cast Baral's Expertise by paying
2. Holding priority, cast Lutri by paying its mana cost plus commander tax, if applicable
3. When Lutri enters, it triggers, copying Baral's Expertise, targeting Lutri
4. Resolve the copy of Baral's Expertise, returning Lutri from the battlefield to your hand, and casting Lutri from your hand without paying its mana cost
5. Repeat from step 3

Results

• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers
• Infinite storm count
• Return any number of artifacts and/or creatures to their owners' hands