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
• You control a nontoken, nonartifact Vampire that can be cast using one colored mana
• You have a nonartifact Vampire card in hand that can be cast using one colored mana
• You have enough mana to cast the Vampire in hand

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