Dark Magician the Dragon Knight is a Dragon Fusion Monster with Attribute DARK, Level 8, ATK 3000, DEF 2500.
Fusion Summons typically need listed materials and a Fusion method (Polymerization, contact, etc.).
On the current TCG and OCG Forbidden & Limited lists tracked here, Dark Magician the Dragon Knight is Unlimited.
YGOPRODeck lists Dark Magician the Dragon Knight for these formats: Duel Links, TCG, OCG, Master Duel.
Dark Magician the Dragon Knight belongs to the Dark Magician archetype—use that tag when searching for engine pieces and tech options.
A listed print of Dark Magician the Dragon Knight appears in Ghosts From the Past: The 2nd Haunting (GFP2-EN125) at Ultra Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Dark Magician the Dragon Knight is about $0.68 on Cardmarket (prices change frequently).
