Felidar Guardian + Altar of the Brood + Spark Double

Prerequisites

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Steps

1. 1Cast Spark Double by paying .
2. 2Spark Double 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 Spark Double'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 Spark Double.
8. 8Repeat from step 2.

Effects

• Infinite ETB
• Infinite LTB
• Infinite mill