Well, it would use your intelligence, so I wouldn't advise picking anything you expect to use against an enemy unit. Barbarian can't concentrate on anything while raging in 5e, if this carries over to BG3, Mage Hand and Dancing Lights are out too as picks. Can anyone in your party use the light provided by the Light cantrip? Blade Ward's resistance is useless while your raging, so it seems a pretty awful pick. I guess Firebolt could be used to set fires, but that's about it besides Light.
