Titania, Nature's Force, Underworld Breach, Phyrexian Altar, and Akoum Hellhound

Prerequisites

• Titania, Nature's Force on the battlefield
• Underworld Breach on the battlefield
• Phyrexian Altar on the battlefield
• Akoum Hellhound on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Akoum Hellhound, adding
2. Akoum Hellhound dies, triggering Titania's second ability, causing you to mill three cards
3. Cast Akoum Hellhound from your graveyard for its escape cost by paying and exiling three other cards from your graveyard
4. Repeat

Results

• Infinite self-mill
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite sacrifice triggers
• Near-infinite storm count