I think to make a compromise and make it a little better, I would change it so it can not be cast in combat, but as a compromise, it would not break stealth when you cast it.
That way you can not use it in combat like you would say fireball, but you can basically trap a choke point, a tunnel etc, and then lure enemies into your traps.
Sounds like a fun playstlyle tbh, a stealth focused wizard
Especially with the spell glyph, so you can cast other spells through the glyph as a trap
