Requires

Felidar Guardian must be on the battlefield. Clever Impersonator must be in hand. Altar of the Brood must be on the battlefield. Mana needed:

Steps

1. Cast Clever Impersonator by paying .
2. Clever Impersonator enters the battlefield as a copy of Felidar Guardian, triggering Altar of the Brood and itself.
3. Resolve the Altar of the Brood trigger, causing each opponent to mill a card.
4. Resolve the Clever Impersonator's trigger, blinking Felidar Guardian.
5. Felidar Guardian enters the battlefield, triggering Altar of the Brood and itself.
6. Resolve the Altar of the Brood trigger, causing each opponent to mill a card.
7. Resolve the Felidar Guardian's trigger, blinking Clever Impersonator.
8. Repeat from step 2.

Results