Felidar Guardian + Altar of the Brood + Phyrexian Metamorph

Felidar Guardian

Altar of the Brood

Phyrexian Metamorph

How it works

1. Cast Phyrexian Metamorph by paying 3U/P.
2. Phyrexian Metamorph 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 Phyrexian Metamorph'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 Phyrexian Metamorph.
8. Repeat from step 2.