Fluttershy is best pony.
CARNIVAL HELLSTEED SPOILER FROM RETURN TO RAVNICA RARE NIGHTMARE HORSE CREATURE
Carnival Hellsteed
Creature - Nightmare Horse (Rare)
First Strike, haste
Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
5/4