Pitiless Plunderer, Phantom Train, Persistent Specimen, and Skittering Precursor

Prerequisites

• Pitiless Plunderer on the battlefield
• Phantom Train on the battlefield
• Persistent Specimen in the graveyard
• Skittering Precursor on the battlefield

Steps

1. Activate Phantom Train by sacrificing Persistent Specimen
2. When Persistent Specimen dies, Pitiless Plunderer and Skittering Precursor trigger
3. Resolve the Pitiless Plunderer trigger, creating a Treasure token
4. Resolve the Skittering Precursor trigger, creating a creature token
5. Resolve the Phantom Train ability
6. Activate the Treasure by tapping and sacrificing it, adding
7. Activate the creature token by sacrificing it, adding
8. When the creature token dies, Pitiless Plunderer triggers, creating a Treasure token
9. Activate the Treasure by tapping and sacrificing it, adding
10. Activate Persistent Specimen by paying , returning it to the battlefield from your graveyard
11. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on a creature