Mikaeus, the Unhallowed, Blasting Station, and Grim Poppet

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Blasting Station on the battlefield
• Grim Poppet on the battlefield

Steps

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

Results

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