Mikaeus, the Unhallowed, Umbral Collar Zealot, and Soulstinger

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Umbral Collar Zealot on the battlefield
• Soulstinger on the battlefield

Steps

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

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite -1/-1 counters
• Infinite surveil