Dualcaster Mage, and Blue Sun's Twilight

Prerequisites

• Dualcaster Mage in hand
• Blue Sun's Twilight in hand
• A player controls a creature with mana value five or less
• available

Steps

1. Cast Blue Sun's Twilight by paying , targeting any creature with mana value five or less
2. Holding priority, cast Dualcaster Mage by paying
3. Dualcaster Mage enters the battlefield, creating a copy of Blue Sun's Twilight, targeting Dualcaster Mage
4. Resolve the copy of Blue Sun's Twilight, creating a token copy of Dualcaster Mage
5. The Dualcaster Mage token enters the battlefield, creating a copy of Blue Sun's Twilight, targeting Dualcaster Mage
6. Repeat from step 4

Results

• Infinite creature tokens
• Infinite ETB
• Infinite magecraft triggers