Clever Impersonator, Copy Enchantment, Oblivion Ring, and Sage of Mysteries

Prerequisites

• Clever Impersonator in hand
• Copy Enchantment in hand
• Oblivion Ring on the battlefield
• Sage of Mysteries on the battlefield
• available

Steps

1. Cast Copy Enchantment by paying
2. Copy Enchantment enters the battlefield as a copy of Oblivion Ring, triggering Sage of Mysteries and itself
3. Resolve the Sage of Mysteries trigger, causing target player to mill two cards
4. Resolve the Copy Enchantment's trigger, exiling Oblivion Ring until it leaves the battlefield
5. Cast Clever Impersonator by paying
6. Clever Impersonator enters the battlefield as a copy of Copy Enchantment, triggering Sage of Mysteries and itself
7. Resolve the Sage of Mysteries trigger, causing target player to mill two cards
8. Resolve the Clever Impersonator's trigger, exiling Copy Enchantment until it leaves the battlefield
9. Copy Enchantment leaves the battlefield, returning Oblivion Ring from exile to the battlefield
10. Sage of Mysteries and Oblivion Ring trigger
11. Resolve the Sage of Mysteries trigger, causing target player to mill two cards
12. Resolve the Oblivion Ring's trigger, exiling Clever Impersonator
13. Clever Impersonator leaves the battlefield, returning Copy Enchantment from exile to the battlefield
14. Repeat from step 2

Results

• Infinite mill
• Infinite self-mill