Advantage Inverse

Choose a creature (friendly or not) within 30 ft including yourself. This creature must fail a wisdom save equal to 10 + your spellcasting modifier. The target can choose to fail the save. If the target fails, disadvantage and advantage rolls swap for the creature. Features that require advantage like sneak attack still function but the attack roll must be made with disadvantage. This effect lasts one minute or until concentration ends.

Your GM will probably hate you for using this.