Felidar Guardian + Altar of the Brood + Clever Impersonator

Prerequisites

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Steps

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

Effects

• Infinite ETB
• Infinite LTB
• Infinite mill