Skeleton Archer

Crumble (Whenever you opponent casts a non-
creature spell put a -1/-1 counter on this creature.)
When Skeleton Archer enters the battlefield it
does 1 damage to any target.
The Skeleton Archers loose volleys of arrows as they advance towards their foe without ever breaking stride. Raising their bows as one, the archers fire, reaching
into quivers for another arrow before the first salvo has
even reached the zenith of its trajectory.