Copy Enchantment, Estrid's Invocation, Oblivion Ring, and Sage of Mysteries

Prerequisites

• Copy Enchantment in hand
• Estrid's Invocation in hand
• Oblivion Ring on the battlefield
• Sage of Mysteries on the battlefield
• available

Steps

1. Cast Estrid's Invocation by paying
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
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

Results

• Infinite mill
• Infinite self-mill