Tenacious Dead, Pitiless Plunderer, Sek'Kuar, Deathkeeper, and Carrion Feeder

Prerequisites

• Tenacious Dead on the battlefield
• Pitiless Plunderer on the battlefield
• Sek'Kuar, Deathkeeper on the battlefield
• Carrion Feeder on the battlefield

Steps

1. Activate Carrion Feeder by sacrificing Tenacious Dead
2. When Tenacious Dead dies, it, Sek'Kuar, and Pitiless Plunderer trigger
3. Resolve the Pitiless Plunderer trigger, creating a Treasure token
4. Resolve the Sek'Kuar trigger, creating a creature token
5. In response to the remaining trigger, activate Carrion Feeder by sacrificing the creature token
6. When the creature token dies, Pitiless Plunderer triggers, creating a Treasure token
7. Resolve the Carrion Feeder 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 Carrion Feeder 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