Ashnod the Uncaring + Spawning Pit + Pitiless Plunderer

Ashnod the Uncaring

Spawning Pit

Pitiless Plunderer

How it works

1. Activate Spawning Pit's first ability by sacrificing a creature.
2. Ashnod and Pitiless Plunderer trigger.
3. Resolve the Pitiless Plunderer trigger, creating a Treasure token.
4. Resolve the Ashnod trigger, copying Spawning Pit's ability.
5. Resolve both Spawning Pit abilities, putting two charge counters on it.
6. Activate the Treasure by tapping and sacrificing it, adding 1.
7. Activate Spawning Pit's second ability by paying 1 and removing two charge counters from it, creating a 2/2 Spawn artifact creature token.
8. Repeat.