Adarkar Valkyrie + Thornbite Staff + Altar of Dementia

Prerequisites

• Adarkar Valkyrie does not have summoning sickness. You control at least one additional nontoken creature.
• Thornbite Staff attached to Adarkar Valkyrie.

Steps

1. 1Activate Adarkar Valkyrie by tapping it, targeting another nontoken creature you control.
2. 2Activate Altar of Dementia by sacrificing the creature targeted in step 1.
3. 3When the creature dies, Adarkar Valkyrie triggers twice.
4. 4Resolve the first trigger, untapping Adarkar Valkyrie.
5. 5Resolve the second trigger, returning the sacrificed creature from your graveyard to the battlefield.
6. 6Resolve the Altar of Dementia ability, causing target player to mill cards equal to the sacrificed creature's power.
7. 7Repeat.

Effects

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