Nether Traitor, Spawning Pit, Sek'Kuar, Deathkeeper, and A Realm Reborn

Prerequisites

• Nether Traitor on the battlefield
• Spawning Pit on the battlefield
• Sek'Kuar, Deathkeeper on the battlefield
• A Realm Reborn on the battlefield

Steps

1. Activate Spawning Pit by sacrificing Nether Traitor Sek'Kuar triggers, creating a 3/1 Graveborn creature token creature with haste
2. Resolve the Spawning Pit ability, putting a charge counter on it
3. Activate the Graveborn token using the ability granted by A Realm Reborn by tapping it, adding
4. Activate Spawning Pit by sacrificing the Graveborn token Nether Traitor triggers, causing you to pay to return it from your graveyard to the battlefield
5. Resolve the Spawning Pit ability, putting a charge counter on it
6. Activate Nether Traitor using the ability granted by A Realm Reborn by tapping it, adding
7. Repeat

Results

• Infinite artifact ETB
• Infinite artifact LTB
• Infinite artifact sacrifice triggers
• Infinite artifact tokens
• Infinite charge counters on a permanent
• Infinite colored mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite creature tokens with haste
• Infinite death triggers