Dualcaster Mage, Rise Again, and Yahenni, Undying Partisan

Prerequisites

• Dualcaster Mage in hand
• Rise Again in hand
• Yahenni, Undying Partisan on the battlefield
• available

Steps

1. Cast Rise Again by paying its mana cost
2. Holding priority, cast Dualcaster Mage by paying its mana cost
3. When Dualcaster Mage enters, it triggers, targeting Rise Again
4. Holding priority, activate Yahenni by sacrificing Dualcaster Mage, Resolve the Dualcaster Mage trigger, copying Rise Again Resolve the Rise Again copy, returning Dualcaster Mage from your graveyard to the battlefield
5. Repeat from step 3

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite magecraft triggers