Underworld Breach, Grinding Station, and Mana Crypt

Prerequisites

• Underworld Breach on the battlefield
• Grinding Station on the battlefield
• Mana Crypt on the battlefield

Steps

1. Activate Mana Crypt by tapping it, adding
2. Activate Grinding Station by tapping it and sacrificing Mana Crypt, causing yourself to mill three cards
3. Cast Mana Crypt from your graveyard for its escape cost by exiling three cards from your graveyard
4. Grinding Station triggers, untapping itself
5. Repeat

Results

• Infinite self-mill
• Near-infinite colorless mana
• Near-infinite storm count