Slimefoot and Squee + Pitiless Plunderer + Viscera Seer

Prerequisites

The persist or undying creature doesn't have a -1/-1 or +1/+1 counter on it, respective to its ability. You control a Saproling.

Steps

1. Activate Viscera Seer 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 Viscera Seer by sacrificing the undying or persist creature.
6. When the creature dies, Pitiless Plunderer triggers, creating a Treasure token.
7. Resolve the Viscera Seer ability.
8. Activate the Treasures by tapping and sacrificing them, adding {B}{R}{G}.
9. Activate Slimefoot and Squee by paying {1}{B}{R}{G} 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.