Dualcaster Mage, and Ephemerate

Prerequisites

• Dualcaster Mage in hand
• Ephemerate in hand
• available

Steps

1. Cast Ephemerate by paying its mana cost
2. Holding priority, cast Dualcaster Mage by paying its mana cost
3. When Dualcaster Mage enters, it triggers, copying Ephemerate, with the copy targeting Dualcaster Mage
4. Resolve the copy of Ephemerate, blinking Dualcaster Mage
5. Repeat from step 3

Results

• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers