Sprinter is definitely one of the most exciting cards in Rivals of Ixalan. It has haste and can't be blocked, which is every aggro player's wet dream. Of course, to be able to play this card effectively, you will have to draft blue-red spells, which are rarely aggressive, so quite an interesting choice of colors here.
In any case, it's a card to look out for and to also be prepared for. Remember that hard removal is the only thing that will be able to deal with it.