New Spells in Strixhaven

[Segev]

The fact that it works on attacks, checks and saves coupled with the after-the-fact trigger makes me think closer to OP than merely strong.

Edit: for perspective, would you consider a 1st level spell that does this to be good?
Range 60'
Reaction (a creature you can see rolls an attack, check or save)
You impose disadvantage on the roll

For my part...no. I would consider that a boring "pass" spell. I'd rather have shield, and even failing that, I'd probably rather have something more fun. Disadvantage on a single attack roll just isn't enough of a defense to be worth a spell slot and your reaction. The one thing this hypothetical spell has that makes it even remotely not just a cantrip is that it works on attacks not directed at you. And it still is a weak 1st level spell, in my opinion.