I find both
Falkenrath Aristocrat and
Yahenni, Undying Partisan work very well in my Edgar deck to weather the board wipes.
Kalitas, Traitor of Ghet does good double duty as a beatstick and graveyard removal.
Since you're running a creature-based white deck, I'd also suggest
True Conviction. With a creature-based token generating deck, I'd consider
Eldrazi Monument.
Also, you definitely should have
New Blood in there - stealing someone else's Lord or type-matters card can have a major turnaround effect on the game. I've taken
Bonescythe Sliver,
Galecaster Colossus, and
Azami, Lady of Scrolls in various games to great effect.
One last suggestion: Put in
Kher Keep (a.k.a. "Vampire McDonald's") to feed your sacrifice effect vampires.