Tenacious Dead, Pitiless Plunderer, Phenomenon Investigators, and Phantom Train

Prerequisites

• Tenacious Dead on the battlefield
• Pitiless Plunderer on the battlefield
• Phenomenon Investigators on the battlefield
• Phantom Train on the battlefield

Steps

1. Activate Phantom Train by sacrificing Tenacious Dead
2. When Tenacious Dead dies, it, Phenomenon Investigators, and Pitiless Plunderer trigger
3. Resolve the Pitiless Plunderer trigger, creating a Treasure token
4. Resolve the Phenomenon Investigators trigger, creating a creature token
5. In response to the remaining trigger, activate Phantom Train by sacrificing the creature token
6. When the creature token dies, Pitiless Plunderer triggers, creating a Treasure token
7. Resolve the Phantom Train ability from step 5
8. Activate two Treasure tokens by tapping and sacrificing them, adding
9. Resolve the Tenacious Dead trigger, paying to return it to the battlefield from your graveyard
10. Resolve the Phantom Train ability from step 1
11. Repeat

Results

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