Nether Traitor, Bloodflow Connoisseur, Sek'Kuar, Deathkeeper, and A Realm Reborn

Prerequisites

• Nether Traitor on the battlefield
• Bloodflow Connoisseur on the battlefield
• Sek'Kuar, Deathkeeper on the battlefield
• A Realm Reborn on the battlefield

Steps

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

Results

• Infinite +1/+1 counters on a creature
• Infinite colored mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers