Workhorse, Mikaeus, the Unhallowed, and Blasting Station

Prerequisites

• Workhorse on the battlefield
• Mikaeus, the Unhallowed on the battlefield
• Blasting Station on the battlefield

Steps

1. Activate Workhorse by removing all +1/+1 counters, adding that many
2. Activate Blasting Station by tapping it and sacrificing Workhorse
3. Workhorse undying ability triggers, returning it to the battlefield with an additional +1/+1 counter on it
4. Blasting Station triggers, untapping it
5. Resolve the Blasting Station's ability, dealing 1 damage to any target
6. Repeat

Results

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