Clever Impersonator + Copy Enchantment + Oblivion Ring + Sage of Mysteries

Clever Impersonator

Copy Enchantment

Oblivion Ring

Sage of Mysteries

How it works

1. Cast Copy Enchantment by paying 2.
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 2.
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.