Dualcaster Mage + Yahenni, Undying Partisan + Behold the Sinister Six!

Prerequisites

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Steps

1. 1Cast Behold the Sinister Six! by paying its mana cost
2. 2Holding priority, cast Dualcaster Mage by paying its mana cost.
3. 3When Dualcaster Mage enters, it triggers, targeting Behold the Sinister Six!.
4. 4Holding priority, activate Yahenni by sacrificing Dualcaster Mage.
5. 5Resolve the Dualcaster Mage trigger, copying Behold the Sinister Six!, with the copy targeting Dualcaster Mage
6. 6Resolve the Behold the Sinister Six! copy, returning Dualcaster Mage from your graveyard to the battlefield.
7. 7Repeat from step 3.

Effects

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite magecraft triggers
• Infinite recursion of creature cards in your graveyard