Dualcaster Mage, Shallow Grave, and Yahenni, Undying Partisan

Prerequisites

• Dualcaster Mage in hand
• Shallow Grave in hand
• Yahenni, Undying Partisan on the battlefield
• available

Steps

1. Cast Shallow Grave by paying its mana cost
2. Holding priority, cast Dualcaster Mage by paying its mana cost
3. When Dualcaster Mage enters, it triggers, targeting Shallow Grave
4. Holding priority, activate Yahenni by sacrificing Dualcaster Mage, Resolve the Dualcaster Mage trigger, copying Shallow Grave Resolve the Shallow Grave 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