Eternal Witness, Phyrexian Altar, and Unearth

Prerequisites

• Eternal Witness on the battlefield
• Phyrexian Altar on the battlefield
• Unearth in hand

Steps

1. Sacrifice Eternal Witness to Phyrexian Altar, for
2. Cast Unearth, returning Eternal Witness from your graveyard to the battlefield
3. Eternal Witness enters, returning Unearth from your graveyard to your hand
4. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count
• Infinite magecraft triggers