Eloise, Nephalia Sleuth, Jinnie Fay, Jetmir's Second, and Altar of Dementia

Prerequisites

• Eloise, Nephalia Sleuth on the battlefield
• Jinnie Fay, Jetmir's Second on the battlefield
• Altar of Dementia on the battlefield
• You control at least one additional creature

Steps

1. Activate Altar of Dementia by sacrificing another creature
2. When the creature dies, Eloise's first ability triggers, and Eloise's second ability triggers if the creature was a token
3. Resolve the first Eloise trigger, creating either a 2/2 Cat or a 3/1 Dog creature token due to Jinnie Fay
4. Resolve the second Eloise trigger, if applicable, causing you to surveil 1
5. Resolve the Altar of Dementia ability, causing target player to mill cards equal to the sacrificed creature's power
6. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite mill
• Infinite self-mill
• Infinite surveil 1