Slimefoot and Squee + Pitiless Plunderer + Yahenni, Undying Partisan

Slimefoot and Squee

Pitiless Plunderer

Yahenni, Undying Partisan

How it works

1. Activate Yahenni twice by sacrificing the persist or undying creature and Slimefoot and Squee.
2. When Slimefoot and Squee and the other creature die, Pitiless Plunderer triggers twice and the other creature's persist or undying ability triggers.
3. Resolve the Pitiless Plunderer triggers, creating two Treasure artifact tokens.
4. Resolve the persist or undying trigger, returning the creature from your graveyard to the battlefield with either a -1/-1 or +1/+1 counter on it.
5. Activate Yahenni by sacrificing the undying or persist creature.
6. When the creature dies, Pitiless Plunderer triggers, creating a Treasure token.
7. Resolve the Yahenni ability.
8. Activate the Treasures by tapping and sacrificing them, adding .
9. Activate Slimefoot and Squee by paying 1 and sacrificing a Saproling.
10. When the Saproling dies, Pitiless Plunderer triggers, creating a Treasure artifact token.
11. Resolve the Slimefoot and Squee ability, returning it and the persist or undying creature from your graveyard to the battlefield.
12. When Slimefoot and Squee enters, it triggers, creating a 1/1 Saproling creature token.
13. Activate a Treasure by tapping and sacrificing it, adding 1.
14. Repeat.

This clever loop centers around Slimefoot and Squee, which uses its own activated ability to recur itself and another creature from the graveyard while spawning a Saproling token upon entering the battlefield. Pitiless Plunderer acts as the economic engine, turning every creature death into a steady supply of Treasure tokens to fund the recursion costs. Meanwhile, Yahenni, Undying Partisan serves as the willing executioner whose sacrifice outlet ability safely sends your creatures to the graveyard to trigger the whole machine.