Aurelia, the Warleader + Adarkar Valkyrie + Altar of Dementia

Prerequisites

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Steps

1. 1Declare Aurelia as an attacker.
2. 2Aurelia triggers, causing you to untap all creatures you control and to get an additional combat phase after this one.
3. 3Holding priority, activate Adarkar Valkyrie by tapping it, making it so the next time Aurelia dies this turn it will be returned to the battlefield.
4. 4Activate Altar of Dementia by sacrificing Aurelia.
5. 5Adarkar Valkyrie triggers, returning Aurelia to the battlefield.
6. 6Resolve the Altar of Dementia's ability, causing target player to mill cards equal to Aurelia's power.
7. 7Repeat.

Effects

• Infinite combat phases
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite mana creatures you control can produce
• Infinite mill
• Infinite untap of creatures you control