Copy Enchantment + Estrid's Invocation + Oblivion Ring + Altar of the Brood

Prerequisites

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Steps

1. 1Cast Estrid's Invocation by paying .
2. 2Estrid's Invocation enters the battlefield, triggering Altar of the Brood and itself.
3. 3Resolve the Altar of Brood trigger, causing each opponent to mill a card.
4. 4Resolve the Estrid's Invocation's trigger, becoming a copy of Oblivion Ring and exiling Oblivion Ring.
5. 5Cast Copy Enchantment by paying .
6. 6Copy Enchantment enters the battlefield, triggering Altar of the Brood and itself.
7. 7Resolve the Altar of Brood trigger, causing each opponent to mill a card.
8. 8Resolve the Copy Enchantment's trigger, becoming a copy of Estrid's Invocation and exiling Estrid's Invocation.
9. 9Estrid's Invocation leaves the battlefield, returning Oblivion Ring from exile to the battlefield.
10. 10Altar of the Brood and Oblivion Ring triggers.
11. 11Resolve the Altar of Brood trigger, causing each opponent to mill a card.
12. 12Resolve the Oblivion Ring's trigger, exiling Copy Enchantment.
13. 13Copy Enchantment leaves the battlefield, returning Estrid's Invocation from exile to the battlefield.
14. 14Repeat from step 2.

Effects

• Infinite creature ETB
• Infinite creature LTB
• Infinite mill