Homing Lightning

Izzet League Spell
Level 4
Casting Time: 1 Action
Range: 120 ft
Make a ranged spell attack against up to 3 (or 4?) targets. On a hit, the target takes 3d6 lightning damage, and the next attack roll made against this target before the end of your next turn has advantage, thanks to the mystical dim light glittering on the target until then.
At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot level above 1st.