Captivating Vampire

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.

Adanto Vanguard

As long as Adanto Vanguard is attacking, it gets +2/+0.
Pay 4 life: Adanto Vanguard gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Plains

Forerunner of the Legion

When Forerunner of the Legion enters the battlefield, you may search your library for a Vampire card, reveal it, then shuffle and put that card on top.
Whenever another Vampire enters the battlefield under your control, target creature gets +1/+1 until end of turn.

Indulgent Aristocrat

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

Rally the Ancestors

Return each creature card with mana value X or less from your graveyard to the battlefield. Exile those creatures at the beginning of your next upkeep. Exile Rally the Ancestors.

Murder

Legion Lieutenant

Champion of Dusk

When Champion of Dusk enters the battlefield, you draw X cards and you lose X life, where X is the number of Vampires you control.

Call to the Feast

Create three 1/1 white Vampire creature tokens with lifelink.

Swamp

Cordial Vampire

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

Queen's Commission

Create two 1/1 white Vampire creature tokens with lifelink.

Duress

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.