Dualcaster Mage, Unbreakable Bond, and Yahenni, Undying Partisan

Prerequisites

• Dualcaster Mage in hand
• Unbreakable Bond in hand
• Yahenni, Undying Partisan on the battlefield
• available

Steps

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