Graceful Reprieve, Dualcaster Mage, and Yahenni, Undying Partisan

Prerequisites

• Graceful Reprieve in hand
• Dualcaster Mage in hand
• Yahenni, Undying Partisan on the battlefield
• available

Steps

1. Cast Graceful Reprieve by paying its mana cost
2. Holding priority, cast Dualcaster Mage by paying its mana cost
3. When Dualcaster Mage enters, it triggers, copying Graceful Reprieve, with the copy targeting Dualcaster Mage
4. Resolve the copy of Graceful Reprieve
5. Holding priority, activate Yahenni by sacrificing Dualcaster Mage
6. When Dualcaster Mage dies, Graceful Reprieve triggers, returning Dualcaster Mage from your graveyard to the battlefield
7. Repeat from step 3
8. Resolve all Yahenni abilities from step 5

Results

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