Koll, the Forgemaster, Sai of the Shinobi, and Phyrexian Altar

Prerequisites

• Koll, the Forgemaster on the battlefield
• Sai of the Shinobi on the battlefield
• Phyrexian Altar on the battlefield
• You have a creature card in hand that can be cast using one colored mana
• You have enough mana to cast the creature card in hand

Steps

1. Cast the creature by paying its mana cost
2. When the creature enters the battlefield, Sai of the Shinobi triggers, attaching Sai of the Shinobi to the creature
3. Activate Phyrexian Altar by sacrificing the creature, adding one mana of any color
4. When the creature dies, Koll triggers, returning the creature from your graveyard to your hand
5. Repeat

Results

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