Horsemanship (This creature can't be blocked except by creatures with horsemanship.)
Sacrifice Xiahou Dun, the One-Eyed: Return target black card from your graveyard to your hand. Activate only during your turn, before attackers are declared.
If a turn has multiple combat phases, the ability can only be activated before the beginning of the declare attackers step of the first combat phase in that turn.
Despite the similarities between horsemanship and flying, horsemanship doesn’t interact with flying or reach.
You can’t activate Xiahou Dun’s ability to return Xiahou Dun itself to your hand. You must choose a target before you sacrifice Xiahou Dun, so it’s not a black card in your graveyard yet.