Dualcaster Mage + Yahenni, Undying Partisan + Return to Action

Prerequisites

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Steps

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

Effects

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