Herald of Hoofbeats 

Creature — Human Knight
Horsemanship (This creature can't be blocked except by creatures with horsemanship.) Other Knights you control have horsemanship.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL