CapnZapp
Legend
Hunter's mark shouldn't even be a spell, maybe Rangers instead should get at level 2 a Hunter's Mark feature which would take a bonus action to size up a seen for for their weaknesses, and then give the +1d6 damage to future attacks against that opponent, until another foe is sized up or a short or long rest passes, and no concentration required.
That's the solution I prefer.
Making it a cantrip feels complicated and wonky in comparison.