Demons return in The Lost Caverns of Ixalan, but with a twist! However, it’s the Black-aligned Vampire Demon in Bloodletter of Aclazotz looks genuinely exciting for Commander and even Constructed, where you can force the opponent to lose twice the number of life lost in your turn. In Constructed formats such as Pioneer where this could become a threat in Mono-Black Devotion-style builds with the iconic Gray Merchant of Asphodel.
However, its Commander is where many players are excited to experiment with the Vampire Demon as cards such as Zulaport Cutthroat and Blood Artist are mainstays in the singleton format and encourage further ways to attack the opponent’s life total. Passively shaving life totals is something Black does remarkably well, and having access to essentially a Wound Reflection with wings will certainly end games of Commander, whether your opponent appreciates it or not.