Its not legal in any format, but for collectors its a piece of Magic history regardless, forming part of the Power 9 (more on those shortly)
This subtle adjustment adds a bit more defensive flexibility without compromising the deck's aggressive core
1 Jungle Shrine
I feel Pestilence might be amazing, it's much better if you can give it Lifelink or Deathtouch, usually via a Counter that Nesting Grounds moved (Boot Nipper, Scavenged Brawler, Unbreakable Bond, Unexpected Fangs, Call of the Death-Dweller, Evolved Sleeper, or Void Beckoner, some of those seem solid actually), but even without either it's a great effect to clear out weenies, and your Commander keeps it around pretty consistently
Some people will consider Sorin a jerk move, but he is a Vampire so I think it's fair game