Mikaeus, the Unhallowed, Evereth, Viceroy of Plunder, and Moonshadow

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Evereth, Viceroy of Plunder on the battlefield
• Moonshadow on the battlefield

Steps

1. Activate Evereth by sacrificing Moonshadow
2. When Moonshadow dies, its undying ability triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it due to its replacement effect
3. Resolve the Evereth ability Repeat

Results

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