Mikaeus, the Unhallowed, Blasting Station, and The Reaper, King No More

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Blasting Station on the battlefield
• The Reaper, King No More on the battlefield

Steps

1. Activate Blasting Station by tapping it and sacrificing The Reaper
2. When The Reaper dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
3. When The Reaper enters the battlefield, it and Blasting Station trigger
4. Resolve the Reaper trigger, putting a -1/-1 counter on it
5. Resolve the Blasting Station trigger, untapping it Resolve the Blasting Station ability from step 1 Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite damage
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite -1/-1 counters
• Infinite recursion of non-Human creatures you control