Mikaeus, the Unhallowed, Bloodied Ghost, and Viscera Seer

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Bloodied Ghost on the battlefield
• Viscera Seer on the battlefield

Steps

1. Activate Viscera Seer by sacrifiicing Bloodied Ghost
2. When Bloodied Ghost dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
3. When it enters, Bloodied Ghost will put a -1/-1 counter on itself, removing the +1/+1 counter
4. Resolve the Viscera Seer ability
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite scry 1