Felidar Guardian + Altar of the Brood + Clever Impersonator

Felidar Guardian

Altar of the Brood

Clever Impersonator

How it works

1. Cast Clever Impersonator by paying 2.
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.