Husam' Tor

Eminence — As long as Husam' Tor is in the
command zone or on the battlefield, Horses you control have "{t}: Target Knight gains your
choice of haste, vigilance, first strike, or flanking
until end of turn. Activate only before combat."
Horses you control have haste.
Whenever a Knight enters the battlefield under
your control, you may pay {w/b} or {r/g}. If you do,
create a 1/1 green Horse creature token.