Abnormal Endurance, Dualcaster Mage, and Yahenni, Undying Partisan

Prerequisites

• Abnormal Endurance in hand
• Dualcaster Mage in hand
• Yahenni, Undying Partisan on the battlefield
• available

Steps

1. Cast Abnormal Endurance by paying its mana cost
2. Holding priority, cast Dualcaster Mage by paying its mana cost
3. When Dualcaster Mage enters, it triggers, copying Abnormal Endurance, with the copy targeting Dualcaster Mage
4. Resolve the copy of Abnormal Endurance
5. Holding priority, activate Yahenni by sacrificing Dualcaster Mage
6. When Dualcaster Mage dies, it triggers, returning it 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