Athreos, Shroud-Veiled + Spawning Pit + Resourceful Defense

Athreos, Shroud-Veiled

Spawning Pit

Resourceful Defense

How it works

1. Activate Spawning Pit by sacrificing the creature with a coin counter on it.
2. When the creature dies, Athreos's second ability and Resourceful Defense's ability trigger.
3. Resolve the Resourceful Defense trigger, putting a coin counter onto itself as well as +1/+1 counters if those were present.
4. Resolve the Athreos trigger, returning the creature from your graveyard to the battlefield.
5. Resolve the Spawning Pit ability from step 1.
6. Activate Spawning Pit by sacrificing Resourceful Defense.
7. When Resourceful Defense dies, it and Athreos's second ability trigger.
8. Resolve the Resourceful Defense trigger, putting a coin counter and +1/+1 counters onto the other nontoken creature.
9. Resolve the Athreos trigger, returning Resourceful Defense from your graveyard to the battlefield.
10. Resolve the Spawning Pit ability from step 6.
11. Repeat.