Olag and Miau, New Friends, Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, and Hammerhead, Maggia Boss

Prerequisites

• Olag and Miau, New Friends on the battlefield
• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Hammerhead, Maggia Boss on the battlefield

Steps

1. Activate Hammerhead by sacrificing the Zombie Cat
2. When the Zombie Cat dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. When the Zombie Cat enters, Olag and Miau's first and second abilities trigger
4. Resolve the first trigger, putting a +1/+1 counter on the Zombie Cat
5. Resolve the second trigger, putting a +1/+1 counter on either a Zombie or Cat you control
6. Resolve the Hammerhead ability, putting a +1/+1 counter on Hammerhead Repeat

Results

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