Black Knight Mini-Set - Inspired by Runescape

Black Knight
Type: Warrior
Attribute: DARK
Level: 4
ATK/DEF: 1500/1900
Effect: When this card is Normal Summoned: You can add 1 "Black Knight" card from your Deck to your hand. When this card is targeted for an attack while in Attack Position; use the DEF of this card to calculate battle damage.

Black Knight's Gilded Kiteshield
Equip Spell Card
Effect: Equip only to a Warrior-Type monster. The equipped monster gains 400 DEF. If the equipped monster you control would be destroyed by a card effect: You can destroy all "Black Knight" Equip Cards equipped to it instead. If a "Black Knight" monster you control is equipped with 1 or more "Black Knight's Gilded Kiteshield" and "Black Knight's Gilded Sabre": You can send that monster to the Graveyard to Special Summon 1 "Black Knight Elite Force" from your Extra Deck and equip all "Black Knight" Equip Cards equipped to the sent monster to the Summoned monster.

Black Knight's Gilded Sabre
Equip Spell Card
Effect: Equip only to a Warrior-Type monster. The equipped monster gains 500 ATK. One time only: You can reveal this card and 1 "Black Knight's Gilded Kiteshield" in your hand to Special Summon 1 level 4 or lower Warrior-Type monster from your hand.

Black Knight Elite Force
Type: Warrior/Fusion
Attribute: DARK
Level: 7
ATK/DEF: 1900/2200
Effect: Must first be Special Summoned from your Extra Deck with "Black Knight's Gilded Kiteshield". When this card is Special Summoned: You can add 1 Equip Spell Card from your Deck or Graveyard to your hand. This card can attack all monsters your opponent controls once each. If a card you control would be destroyed by your opponents card effect: You can send 1 "Black Knight" Equip Card equipped to this card to the Graveyard instead.

...There's already a card named "The Black Knight". And we already have a bunch of Warrior archetypes.