Moment of Reckoning, Dualcaster Mage, and Yahenni, Undying Partisan

Prerequisites

• Moment of Reckoning in hand
• Dualcaster Mage in hand
• Yahenni, Undying Partisan on the battlefield
• available

Steps

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

Results

• Destroy any number of nonland permanents
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite magecraft triggers
• Infinite recursion of creature cards in your graveyard
• Infinite sacrifice triggers