One of my favorite D/D cards, sadly, he's not used in the deck itself.
✨D/D Proud Chevalier😈🗡
First released in V Jump Edition Pendulum Victory Pack in 2014 (wow, has already been 4 years!)
Pendulum Effect: Once per turn: You can pay 500 LP, then target 1 face-up monster your opponent controls; it loses 500 ATK (even if this card leaves the field). Unless you have a "D/D" card in your other Pendulum Zone, this card's Pendulum Scale becomes 5.
Monster Effect: When this card is Normal Summoned: You can add 1 face-up DARK Pendulum Monster from your Extra Deck to your hand.