You have cards that make lots of Vampire tokens (like March of the Canonized, Mavren Fein, Charismatc Conqueror, and Sorin), cards that make Vampires bigger (like Legion Lieutenant, Etchings of the Chosen, and Radiant Destiny), as well as cards to keep your Vampires in play (like Timothar, Kindred Boon, and Dusk Legion Lieutenant)
With the ever-expanding nature of the Historic format, Wizards has taken the opportunity presented to add cards to the format that wouldn't be able to be added through the Standard format
Finally, you can also straight up buy codes from Gray Viking Games.commore on that later
These are permission spells (as in: "Please, Reid, may I pleeease cast my spell?")