You may pay {B} rather than pay this spell's mana cost if there are thirteen or more creatures on the battlefield. Each player sacrifices thirteen creatures of their choice.

Each opponent loses X life. You gain life equal to the life lost this way.

Destroy target creature or enchantment an opponent controls. You lose life equal to that permanent's mana value.

Each non-Vampire creature gets -X/-X until end of turn, where X is the number of Vampires you control.

Target player draws two cards and loses 2 life.

{T}: Add one mana of any color in your commander's color identity.

Whenever a creature dies, put a +1/+1 counter on equipped creature. If equipped creature is a Vampire, put two +1/+1 counters on it instead. Equip {1}

{1}, {T}: Add {R}{W}.

Equipped creature has haste and shroud. (It can't be the target of spells or abilities.) Equip {0}

{1}, {T}: Add {W}{B}.

{1}, {T}: Add {B}{R}.

Equipped creature gets +1/-1. Whenever equipped creature dies, draw two cards. Equip {1}

{T}: Add {C}{C}.

Whenever one or more tokens you control enter, create a 1/1 black Vampire Rogue creature token with lifelink. This ability triggers only once each turn. {1}{B}, Sacrifice another creature or artifact: Draw a card.

Whenever this creature or another creature dies, target player loses 1 life and you gain 1 life.

Other Vampire creatures you control get +1/+1. Tap five untapped Vampires you control: Gain control of target creature. It becomes a Vampire in addition to its other types.

Whenever this creature or another creature dies, put a +1/+1 counter on each Vampire you control.

Lifelink {2}, Sacrifice a creature: Put a +1/+1 counter on each Vampire you control.

Other Vampires you control get +1/+1.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) Lifelink Other Vampires you control get +1/+1. Madness {2}{B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Flying {1}{R}: Olivia Voldaren deals 1 damage to another target creature. That creature becomes a Vampire in addition to its other types. Put a +1/+1 counter on Olivia Voldaren. {3}{B}{B}: Gain control of target Vampire for as long as you control Olivia Voldaren.

Whenever a Vampire you control deals combat damage to a player, put a +1/+1 counter on it.

First strike Other Vampire creatures you control get +1/+1 and have first strike.

Menace (This creature can't be blocked except by two or more creatures.) When this creature enters, if an opponent lost life this turn, put a +1/+1 counter on each other Vampire you control. As long as an opponent lost life this turn, each other Vampire you control enters with an additional +1/+1 counter on it.

Whenever this creature or another creature you control dies, target opponent loses 1 life and you gain 1 life.

Exile target creature. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Exile target creature. Its controller gains life equal to its power.