Mikaeus, the Unhallowed, Blasting Station, and Slumbering Walker

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Blasting Station on the battlefield
• Slumbering Walker on the battlefield

Steps

1. Activate Blasting Station by tapping it and sacrificing Slumbering Walker
2. When Slumbering Walker 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. When Slumbering Walker enters, Blasting Station triggers, untapping Blasting Station
4. Resolve the Blasting Station ability from step 1 Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite damage
• Infinite death triggers
• Infinite sacrifice triggers