Mikaeus, the Unhallowed, Blasting Station, and River Kelpie

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Blasting Station on the battlefield
• River Kelpie on the battlefield

Steps

1. Activate Blasting Station by tapping it and sacrificing River Kelpie
2. When River Kelpie dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. When River Kelpie enters, it and Blasting Station trigger
4. Resolve the River Kelpie trigger, causing you to draw a card
5. Resolve the Blasting Station trigger, untapping it
6. Resolve the Blasting Station ability from step 1
7. Activate Blasting Station by tapping it and sacrificing River Kelpie
8. When River Kelpie dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
9. Repeat steps 3 through 5 once
10. Resolve the Blasting Station ability from step 7
11. Repeat

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite damage
• Near-infinite death triggers
• Near-infinite sacrifice triggers
• Near-infinite mana creatures you control can produce
• Near-infinite untap of creatures you control