Baral's Expertise, and Dualcaster Mage

Prerequisites

• Baral's Expertise in hand
• Dualcaster Mage in hand
• available

Steps

1. Cast Baral's Expertise by paying
2. Holding priority, cast Dualcaster Mage by paying
3. Dualcaster Mage enters the battlefield, creating a copy of Baral's Expertise targeting Dualcaster Mage
4. Resolve the copy of Baral's Expertise, returning Dualcaster Mage from the battlefield to your hand, and casting Dualcaster Mage 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