Mazzy, Truesword Paladin, Ajani's Chosen, and Phyrexian Altar

Prerequisites

• Mazzy, Truesword Paladin on the battlefield
• Ajani's Chosen on the battlefield
• Phyrexian Altar on the battlefield
• You control an Aura that can be cast using one colored mana attached to another creature you control

Steps

1. Activate Phyrexian Altar by sacrificing the creature with the Aura attached, adding one mana of any color
2. Mazzy's second ability triggers, exiling the Aura and allowing you to cast it this turn
3. Cast the Aura by paying its mana cost, targeting Mazzy
4. Whenever the Aura enters the battlefield, Ajani's Chosen triggers, creating a 2/2 Cat creature token and attaching the Aura to it
5. Repeat

Results

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