Cast Oathsworn Vampire from your graveyard by paying {1}{B}.
Edgar triggers, creating a 1/1 Vampire creature token.
Activate Phyrexian Altar twice by sacrificing the Vampire token and Oathsworn Vampire, adding {1}{B}.
Repeat.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Infinite storm count

Edgar Markov

Oathsworn Vampire

Phyrexian Altar

Cast the nonartifact Vampire from your hand by paying its mana cost.
Edgar triggers, creating a 1/1 Vampire creature token.
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.
Activate Phyrexian Altar by sacrificing the Vampire token, adding one mana of any color.
Repeat.

Cloudstone Curio

Cast Oathsworn Vampire either from your hand or graveyard by paying {1}{B}.
Edgar triggers, creating a 1/1 Vampire creature token.
Activate Warren Soultrader by paying 1 life and sacrificing Oathsworn Vampire.
When Oathsworn Vampire dies, Blood Artist triggers, causing target opponent to lose 1 life and you to gain 1 life.
Resolve the Warren Soultrader ability, creating a Treasure token.
Repeat steps 3 through 5 once, sacrificing the Vampire token instead.
Activate two Treasures by tapping and sacrificing them, adding {1}{B}.
Repeat.

Infinite lifeloss

Infinite lifegain triggers

Warren Soultrader

Blood Artist

Cast Oathsworn Vampire either from your hand or graveyard by paying {1}{B}.
Edgar triggers, creating a 1/1 Vampire creature token.
When the Vampire and Oathsworn Vampire enter, Elas il-Kor's first ability triggers twice, causing you to gain 2 life.
Activate Warren Soultrader by paying 1 life and sacrificing Oathsworn Vampire.
When Oathsworn Vampire dies, Elas il-Kor's second ability triggers, causing each opponent to lose 1 life.
Resolve the Warren Soultrader ability, creating a Treasure token.
Repeat steps 4 through 6 using the Vampire token instead.
Activate two Treasures by tapping and sacrificing them, adding {1}{B}.
Repeat.

Combos with "Edgar Markov"