Distraction Cascade

2nd-level divination

Casting Time: 1 reaction, which you take when an ally declares an attack against an enemy you can see
Range: 30 feet
Components: V, S
Duration: Instantaneous

With a flash of foresight, you throw a foe off balance. Choose one creature you can see that your ally has just declared as the target of an attack. Unless that creature makes a successful Charisma saving throw, attacks against it are made with advantage until the end of this turn.