Tenacious Dead + Pitiless Plunderer + Sek'Kuar, Deathkeeper + Yahenni, Undying Partisan

Tenacious Dead

Pitiless Plunderer

Sek'Kuar, Deathkeeper

Yahenni, Undying Partisan

How it works

1. Activate Yahenni 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 Yahenni by sacrificing the creature token.
6. When the creature token dies, Pitiless Plunderer triggers, creating a Treasure token.
7. Resolve the Yahenni ability from step 5.
8. Activate two Treasure tokens by tapping and sacrificing them, adding .
9. Resolve the Tenacious Dead trigger, paying 1 to return it to the battlefield from your graveyard.
10. Resolve the Yahenni ability from step 1.
11. Repeat.