[1.11]

Ever wanted to shoot a trail of evocation fangs? Well now you can :D
All you need is snowballs

Paste this into a command block set to:
Repeat | Unconditional | Always Active

/execute @e[type=snowball] ~ ~-3 ~ /summon evocation_fangs

To use this, aim the snowball a little higher than the targets hitbox to do damage because the command is set to aim 3 blocks down so as not to harm you when you use it.

Enjoy!
(keep in mind not to aim to high up or you will take damage)
(I'm not that experienced with commands so it won't be perfect)