Night's Cavalry

Haste
It's turning night when Night's Cavalry enters
the battlefield. When its night, all your knights
gain +3/+3. When its turning to day, shuffle
Night's Cavalry back in to your library.
The Night's Cavalry, who now wander the dim roads
at night, were once led by the Fell Omen and were deliverers of death for great warriors, knights, and champions.