Land

: Add

.

, Pay 1 life: Add one mana of any color. Spend this mana only to cast a Vampire spell.

,

: Create a Blood token. This ability costs

less to activate for each Vampire you control. (It's an artifact with "

,

, Discard a card, Sacrifice this token: Draw a card.")
A Vampire spell is a spell with the creature type Vampire on its type line, regardless of whether the word "Vampire" is in its name.
If an effect refers to a Blood token, it means any artifact token with the subtype Blood, even if it has gained other subtypes.
You can't sacrifice a Blood token to pay multiple costs.
Some triggered abilities trigger "whenever you sacrifice a Blood token." These abilities trigger regardless of why you sacrificed that Blood token.