Xiahou Dun, the One-Eyed is a rare Legendary Creature — Human Soldier card from Portal Three Kingdoms (PTK), collector number 92. Current market price: $184.50, TCGplayer market prices via Scryfall.
Horsemanship (This creature can't be blocked except by creatures with horsemanship.) Sacrifice Xiahou Dun: Return target black card from your graveyard to your hand. Activate only during your turn, before attackers are declared.