Sek'Kuar, Deathkeeper + Cryptolith Rite + Nether Traitor + Spawning Pit

Sek'Kuar, Deathkeeper

Cryptolith Rite

Nether Traitor

Spawning Pit

How it works

1. Activate Spawning Pit's first ability by sacrificing Nether Traitor.
2. Sek'Kuar triggers, creating a 3/1 Graveborn creature token creature with haste.
3. Resolve the Spawning Pit ability, putting a charge counter on it.
4. Activate the Graveborn token using the ability from Cryptolith Rite by tapping it, adding .
5. Activate Spawning Pit's first ability by sacrificing the Graveborn token.
6. Nether Traitor triggers, causing you to pay to return it from your graveyard to the battlefield.
7. Resolve the Spawning Pit ability, putting a charge counter on it.
8. Activate Nether Traitor using the ability from Cryptolith Rite by tapping it, adding one mana of any color.
9. Repeat.
10. Once you have infinite mana, you may activate Spawning Pit's last ability any number of times.