Copy Enchantment + Estrid's Invocation + Oblivion Ring + Sage of Mysteries

Copy Enchantment

Estrid's Invocation

Oblivion Ring

Sage of Mysteries

How it works

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