Double Major, Twincast, and Dualcaster Mage

Prerequisites

• Double Major in hand
• Twincast in hand
• Dualcaster Mage in hand
• available

Steps

1. Cast Dualcaster Mage for
2. Holding priority, cast Double Major targeting Dualcaster Mage
3. Holding priority, cast Twincast, copying Double Major, targeting Dualcaster
4. Let the copied Double Major resolve, creating a token copy of Dualcaster Mage
5. Dualcaster Mage enters the battlefield, copying Double Major, targeting Dualcaster Mage
6. Repeat from Step 4

Results

• Infinite creature tokens
• Infinite ETB