Mazzy, Truesword Paladin, Phyrexian Altar, and Cartouche of Solidarity

Prerequisites

• Mazzy, Truesword Paladin on the battlefield
• Phyrexian Altar on the battlefield
• Cartouche of Solidarity in hand
• available

Steps

1. Cast Cartouche of Solidarity by paying , attaching it to another creature you control
2. When Cartouche of Solidarity enters, it triggers, creating a 1/1 Warrior creature token
3. Activate Phyrexian Altar by sacrificing the creature that has Cartouche of Solidarity attached to it, adding
4. Mazzy's second ability triggers, exiling Cartouche of Solidarity from your graveyard with the ability to cast it until the end of your next turn
5. Cast Cartouche of Solidarity by paying , attaching it to the Warrior made in step 2
6. Repeat from step 2

Results

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