Mikaeus, the Unhallowed, Dread Tiller, and Hammerhead, Maggia Boss

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Dread Tiller on the battlefield
• Hammerhead, Maggia Boss on the battlefield

Steps

1. Activate Hammerhead by sacrificing Dread Tiller
2. When Dread Tiller dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
3. When Dread Tiller enters the battlefield, it triggers, putting a -1/-1 counter on it
4. Resolve the Hammerhead ability Repeat

Results

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