Clever Impersonator + Estrid's Invocation + Oblivion Ring + Sage of Mysteries

Prerequisites

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Steps

1. 1Cast Estrid's Invocation by paying .
2. 2Estrid's Invocation enters the battlefield, triggering Sage of Mysteries 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 Clever Impersonator by paying .
6. 6Clever Impersonator enters the battlefield, triggering Sage of Mysteries and itself.
7. 7Resolve the Altar of Brood trigger, causing each opponent to mill a card.
8. 8Resolve the Clever Impersonator'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. 10Sage of Mysteries 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 Clever Impersonator.
13. 13Clever Impersonator 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