Dualcaster Mage, and Cloudshift

Prerequisites

• Dualcaster Mage in hand
• Cloudshift in hand
• available

Steps

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

Results

• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers