Clever Impersonator | Copy Enchantment | Oblivion Ring

(and one other card)

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

Cast
Copy Enchantment by paying ({2} magic symbol) ({U} magic symbol) .
Copy Enchantment enters the battlefield, 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, becoming a copy of
Oblivion Ring and exiling
Oblivion Ring.
Cast
Clever Impersonator by paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Clever Impersonator enters the battlefield, triggering
Altar of the Brood and itself.
Resolve the
Altar of Brood trigger, causing each opponent to mill a card.
Resolve the
Clever Impersonator's trigger, becoming a copy of
Copy Enchantment and exiling
Copy Enchantment.
Copy Enchantment leaves the battlefield, returning
Oblivion Ring from exile to the battlefield.
Altar of the Brood and
Oblivion Ring triggers.
Resolve the
Altar of Brood trigger, causing each opponent to mill a card.
Resolve the
Oblivion Ring's trigger, exiling
Clever Impersonator.
Clever Impersonator leaves the battlefield, returning Copy enchantment from exile to the battlefield.
Repeat from step 2.