mtg vampire commander deck Edgar Markov Vampires Tribal Best Vampire commander besides Edgar?

This lets them play into the Human Typal sub-theme that 5-Color Legends tends to use

The card quality and tutor effects are simply much more mana efficient so unless the combo deck has alternate uses for the specific draw spell such as a discard outlet or recursion effect it will avoid the latter in preference for the former

Other card games sometimes have guaranteed amounts of certain rarities in a booster box, or in a case of booster boxes

I especially like them in this deck

That said, I personally like Nahiri, Forged in Fury for her ability to circumvent commander tax and potentially play a lot of free cards

Even with Archmage's Charm filling its role in Eternal formats, the command is still worth including in tons of blue EDH decks