My own homebew goes like this:
Witchbolt
Level 1 Evocation
Range 60 feet
Duration 1 Minute (Concentration)
A beam of crackling, blue energy lances out toward a creature within range, forming a sustained arc of lightning between you and the target.
Make a ranged spell attack against that creature. On a hit, the target takes 1d12 lightning damage. and the target is grappled until it use its action to succeed at a Dex (Acrobatic) or Str (Athletic) check against your spell DC. On each of your turns for the duration, you can use an action to deal 1d12 lightning damage to the target automatically and pull it 10 ft toward you.
The spell ends if the target is outside the spell’s range, or if it has total cover from you.
At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the both damage instances increase by 1d12 for each slot level above 1st.
This one I like a lot.
Using the spell save DC is a good thought so the grapple check is not often laughably bad.