Cairngorgon, Antiluminescent Knight is a Rock XYZ Monster with Attribute DARK, Level 4, ATK 2450, DEF 1950.
Xyz Monsters are usually Summoned using materials of matching Level; their effects often detach materials as cost.
On the current TCG and OCG Forbidden & Limited lists tracked here, Cairngorgon, Antiluminescent Knight is Unlimited.
YGOPRODeck lists Cairngorgon, Antiluminescent Knight for these formats: Duel Links, Common Charity, TCG, OCG, Master Duel.
A listed print of Cairngorgon, Antiluminescent Knight appears in 2015 Mega-Tin Mega Pack (MP15-EN030) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Cairngorgon, Antiluminescent Knight is about $0.17 on Cardmarket (prices change frequently).
