Cavalry's Levy

Tap all creatures target opponent controls. Knight creatures you control gain Haste until end of turn.
"The horn rang out through the battlefield, and chilled the very souls of every man who heard it. Then came the unsheathing of swords, the hoofbeats, the sound of clanging metal. We all knew. The Brotherhood had come."
~Gunthar, 4th Battalion Captain of the Pheraxian Army