Phyrexian Altar + Spark Elemental + Titania, Nature's Force + Underworld Breach

RG identity

Commander legal

The 4 combo pieces

• Phyrexian Altar
• Spark Elemental
• Titania, Nature's Force
• Underworld Breach

How to execute it

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

What the combo produces

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