While Edgar Markov's other ability definitely makes attacking with it successfully valuable, just casting Vampire spells in general will amass a favorable board state
Also, building decks was always one of my favorite things (maybe even more than playing)
You can also burn your opponent out when you draw cards thanks to threats like Psychosis Crawler, Queza, Augur of Agonies, and Niv-Mizzet, Parun
Here are some additional cards you might want to consider for your infect-themed decks that are popular across the archetype: Filigree Vector Blightsteel Colossus Tainted Strike Inkmoth Nexus Corrupted Conscience Phyresis Dreamtide Whale Whispering Specter Commanding Conclusion Skithiryx, the Blight Dragon | Illustration by Chippy Infect decks can be very powerful, but some players might argue a little too powerful in Commander
This will be good in some equipment decks, but because it searches for an artifact in general I think it will make a splash here and there