Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Flayer of the Hatebound, and Hammerhead, Maggia Boss

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Flayer of the Hatebound on the battlefield
• Hammerhead, Maggia Boss on the battlefield

Steps

1. Activate Hammerhead by sacrificing Flayer of the Hatebound When Flayer of the Hatebound dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
2. When Flayer of the Hatebound enters, it triggers, dealing damage to any target
3. Activate Hammerhead by sacrificing Flayer of the Hatebound When Flayer of the Hatebound dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
4. When Flayer of the Hatebound enters, it triggers, dealing damage to any target
5. Resolve both Hammerhead abilities from step 1 and 4
6. Repeat

Results

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