Bloodsworn Squire // Bloodsworn Knight

Bloodsworn SquireCreature — Vampire Soldier

{1}{B}, Discard a card: This creature gains indestructible until end of turn. Tap it. Then if there are four or more creature cards in your graveyard, transform this creature. (Damage and effects that say "destroy" don't destroy it.)

Bloodsworn KnightCreature — Vampire Knight

Bloodsworn Knight's power and toughness are each equal to the number of creature cards in your graveyard. {1}{B}, Discard a card: This creature gains indestructible until end of turn. Tap it. (Damage and effects that say "destroy" don't destroy it.)