Eloise, Nephalia Sleuth, Jinnie Fay, Jetmir's Second, and Yahenni, Undying Partisan

Prerequisites

• Eloise, Nephalia Sleuth on the battlefield
• Jinnie Fay, Jetmir's Second on the battlefield
• Yahenni, Undying Partisan on the battlefield
• You control at least one additional creature

Steps

1. Activate Yahenni 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 Yahenni ability
6. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite surveil 1