Copy Enchantment + Estrid's Invocation Combos

2 known combos featuring both cards in Commander

Infinite mill Infinite self-mill Infinite ETB Infinite LTB

Combo 1 with Oblivion Ring + Sage of Mysteries

Results: Infinite mill · Infinite self-mill
Steps
  1. Cast Estrid's Invocation by paying {2}{U}.
  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}{U}{U}.
  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.

Combo 2 with Oblivion Ring + Altar of the Brood

Results: Infinite ETB · Infinite LTB · Infinite mill
Show steps
  1. Cast Estrid's Invocation by paying {2}{U}.
  2. Estrid's Invocation enters the battlefield, triggering Altar of the Brood and itself.
  3. Resolve the Altar of Brood trigger, causing each opponent to mill a card.
  4. Resolve the Estrid's Invocation's trigger, becoming a copy of Oblivion Ring and exiling Oblivion Ring.
  5. Cast Copy Enchantment by paying {2}{U}{U}.
  6. Copy Enchantment enters the battlefield, triggering Altar of the Brood and itself.
  7. Resolve the Altar of Brood trigger, causing each opponent to mill a card.
  8. Resolve the Copy Enchantment's trigger, becoming a copy of Estrid's Invocation and exiling Estrid's Invocation.
  9. Estrid's Invocation leaves the battlefield, returning Oblivion Ring from exile to the battlefield.
  10. Altar of the Brood and Oblivion Ring triggers.
  11. Resolve the Altar of Brood trigger, causing each opponent to mill a card.
  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.
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