Syphon Luck

In casting Syphon Luck, you change the twists of fate and steal that which is gained by others. You choose another creature, selecting either Attacks, Saves, or Ability Checks in which the creature is cursed with disadvantage or advantage with whichever the selected roll is. In applying this effect to the selected creature, you gain the opposing effect to balance the effect of the spell. 

The spell requires a Charisma(CHA) save, for unwilling creatures, against the casters spell saving throw DC. On a success, the caster rolls a 1d4 which for 1 round is either taken away or added to rolls from the targeted creature of the selected roll. On a failure, the spell takes full effect, the targeted creature can make a saving throw at the end of each of their turns.