Falkenrath Gorger: 2/1 for a one drop is pretty good as is, but he has the added benefit of making any vampire not in play have Madness. So that means vamps like Olivia or Drana will have Madness, meaning that you can chat them in at any time mana forbidding.
Insolent Neonate: The deck is fairly weak in the card draw department, as a result the deck is fragile to losing momentum. However despite his Insolence, he kindly tries to help lessen our weakness by taking one for the team and enabling Madness.
Heir of Falkenrath
: A Madness enabler that can flip into a 3/2 with flying at any time. Combo with the Youths and swing for 7 turn 3 or hold off flipping her to surprise your opponent's attackers.
Stromkirk Condemned: The heir's estranged cousin. A bit hard to cast early because it's , but the constant opportunities for Madness and an anthem for your Vampires is hard to pass up.
Drana, Liberator of Malakir: A 3 mana 2/3 flyer with first strike is good on its own, but Drana compliments early aggression by giving +1/+1 counters to everyone who attacks with her. With not too many flyers to oppose her, she can make your board get out of hand pretty fast.
Olivia, Mobilized for War: Creating a Madness opportunity when a vampire enters the show, she beefs them up and gives them haste on top of that. Aside from that, she's still a 3 mana 3/3 flyer
Incorrigible Youths: If you cast the Youths for its normal cost, something's either wrong or you're trolling. You almost always want to, should, and can cast for Madness.