Nether Traitor, Hammerhead, Maggia Boss, Sek'Kuar, Deathkeeper, and Enduring Vitality

Prerequisites

• Nether Traitor on the battlefield
• Hammerhead, Maggia Boss on the battlefield
• Sek'Kuar, Deathkeeper on the battlefield
• Enduring Vitality on the battlefield

Steps

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