Pitiless Plunderer + Spawning Pit + Vorinclex, Monstrous Raider

Pitiless Plunderer

Spawning Pit

Vorinclex, Monstrous Raider

How it works

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