Mikaeus, the Unhallowed, Blasting Station, and Kithkin Spellduster

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Blasting Station on the battlefield
• Kithkin Spellduster on the battlefield

Steps

1. Activate Blasting Station by tapping it and sacrificing Kithkin Spellduster
2. When Kithkin Spellduster dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. When Kithkin Spellduster enters, Blasting Station triggers, untapping Blasting Station
4. Resolve the Blasting Station ability from step 1
5. Activate Blasting Station by tapping it and sacrificing Kithkin Spellduster
6. When Kithkin Spellduster dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
7. When Kithkin Spellduster enters, Blasting Station triggers, untapping Blasting Station
8. Resolve the Blasting Station ability from step 5
9. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite damage
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control