Underworld Breach, Lion's Eye Diamond, and Brain Freeze

Prerequisites

• Underworld Breach on the battlefield
• Lion's Eye Diamond on the battlefield
• Brain Freeze in the graveyard
• You have at least six other cards in hand and/or graveyard

Steps

1. Activate Lion's Eye Diamond by discarding your hand and sacrificing it, adding
2. Cast Lion's Eye Diamond from your graveyard for its escape cost by exiling three cards besides Brain Freeze from your graveyard
3. Cast Brain Freeze from your graveyard for its escape cost by paying and exiling three cards from your graveyard
4. Brain Freeze's storm ability triggers, creating at least one copy of Brain Freeze targeting yourself, and any remaining copies targeting an opponent
5. Resolve each Brain Freeze, causing yourself to mill six cards and, if applicable, an opponent to mill three cards for each Brain Freeze remaining
6. Repeat

Results

• Infinite self-mill
• Near-infinite colored mana
• Near-infinite magecraft triggers
• Near-infinite mill
• Near-infinite storm count