You both make good points, thanks! I'll be taking blindness/deafness in the future.
Treeantmonk changes blindness/deafness's rating to blue if the wizard has portent, a divination school ability.
Why is blindness/deafness blue with portent? Making someone fail the save only counts for one round, as the target will get another save each consecutive round. Why isn't levitate blue instead? If you fumble someone's save with that, the target is screwed for a minute.