Cast Clever Impersonator by paying its mana cost, choosing to have it enter the battlefield as a copy of Felidar Guardian
When Clever Impersonator enters the battlefield, it triggers, blinking Felidar Guardian.
When Felidar Guardian enters the battlefield, it triggers, blinking Clever Impersonator. Choose to have Clever Impersonator enter the battlefield as a copy of Felidar Guardian.
Repeat from step 2.

Infinite ETB

Infinite LTB

Clever Impersonator

Felidar Guardian

Cast Clever Impersonator by paying {2}{U}{U}.
Clever Impersonator enters the battlefield as a copy of Felidar Guardian, triggering Altar of the Brood and itself.
Resolve the Altar of the Brood trigger, causing each opponent to mill a card.
Resolve the Clever Impersonator's trigger, blinking Felidar Guardian.
Felidar Guardian enters the battlefield, triggering Altar of the Brood and itself.
Resolve the Altar of the Brood trigger, causing each opponent to mill a card.
Resolve the Felidar Guardian's trigger, blinking Clever Impersonator.
Repeat from step 2.

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