Pheromosa

Double strike, haste, predator (Whenever a creature dealt damage by Pheromosa this turn dies,
put a +1/+1 counter on Pheromosa)
Pheromosa can't be blocked by creatures unless their controller pays {2} for each creature blocking it.
Its elegant body is capable of sudden feats of acceleration. It also produces a sort of disarming pheromone.