Copy Enchantment | Mirrormade | Oblivion Ring

(and one other card)

Copy Enchantment and
Mirrormade in hand.
Oblivion Ring and
Altar of the Brood on the battlefield.
({3} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) available.

Cast
Mirrormade by paying ({2} magic symbol) ({U} magic symbol) .
Mirrormade enters the battlefield as a copy of
Oblivion Ring, triggering
Altar of the Brood and itself.
Resolve the
Altar of Brood trigger, causing each opponent to mill a card.
Resolve the
Mirrormade's trigger, exiling
Oblivion Ring.
Cast
Copy Enchantment by paying ({2} magic symbol) ({U} magic symbol) .
Copy Enchantment enters the battlefield as a copy of the
Oblivion Ring copy, triggering
Altar of the Brood and itself.
Resolve the
Altar of Brood trigger, causing each opponent to mill a card.
Resolve the
Copy Enchantment's trigger, exiling
Mirrormade.
Mirrormade leaves the battlefield, triggering itself, returning
Oblivion Ring from exile to the battlefield.
Altar of the Brood and
Oblivion Ring trigger.
Resolve the
Altar of Brood trigger, causing each opponent to mill a card.
Resolve the
Oblivion Ring trigger, exiling
Copy Enchantment.
Copy Enchantment leaves the battlefield, returning
Mirrormade from exile to the battlefield.
Repeat from step 2 until each opponent has an empty library, then end the loop by choosing to copy or exile any other permanent.