Edgar Markov, Cloudstone Curio, and Phyrexian Altar

Prerequisites

• Edgar Markov on the battlefield or in the command zone
• Cloudstone Curio on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Cast the nonartifact Vampire from your hand by paying its mana cost
2. Edgar triggers, creating a 1/1 Vampire creature token
3. The nontoken Vampire enters the battlefield, triggering Cloudstone Curio, returning any other nontoken, nonartifact Vampire that can be cast using one colored mana from the battlefield to your hand
4. Activate Phyrexian Altar by sacrificing the Vampire token, adding one mana of any color
5. Repeat

Results

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