Bloodghast can't block. Bloodghast has haste as long as an opponent has 10 or less life. Landfall — Whenever a land you control enters, you may return Bloodghast from your graveyard to the battlefield.
Summoning it is easy. Controlling it is another matter.
Flying {T}: Create a 2/2 black Vampire creature token with flying. {B}: Transform Bloodline Keeper. Activate only if you control five or more Vampires.
Changeling As Bloodline Pretender enters, choose a creature type. Whenever another creature you control of the chosen type enters, put a +1/+1 counter on Bloodline Pretender.
When Bloodrage Alpha enters the battlefield, choose one — • Another target Wolf or Werewolf you control fights target creature you don't control. • You get a one-time boon with "When you cast a Wolf or Werewolf spell, it gains 'When this creature enters, it fights up to one target creature you don't control.'"
Bloodsoaked Champion can't block. Raid — {1}{B}: Return Bloodsoaked Champion from your graveyard to the battlefield. Activate only if you attacked this turn.
"Death is merely another foe the Mardu will overcome."
This spell costs {1} less to cast for each 1 life your opponents have lost this turn. Target opponent exiles the top three cards of their library. Until the end of your next turn, you may play those cards. If you cast a spell this way, mana of any type can be spent to cast it.
Bloodsworn Knight's power and toughness are each equal to the number of creature cards in your graveyard. {1}{B}, Discard a card: Bloodsworn Knight gains indestructible until end of turn. Tap it.