Go Ninja Go, and Dualcaster Mage

Prerequisites

• Go Ninja Go in hand
• Dualcaster Mage in hand
• available

Steps

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

Results

• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers