Luminous Broodmoth + Felidar Guardian + Gravity Sphere + Altar of Dementia

Prerequisites

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Steps

1. 1Sacrifice Felidar Guardian to Altar of Dementia to mill target player for 1.
2. 2Luminous Broodmoth triggers, returning Felidar Guardian to the battlefield with a flying counter on it.
3. 3Felidar Guardian's ETB triggers, exiling Mystic Decree and then returning it to the battlefield.
4. 4Repeat.

Effects

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite mill