Paul Farquhar
Legend
Mark Two, taking into account WotC don't like class specific feats (this also buffs it a little).
Feat: Sneaky Spells (perquisite: can cast at least one spell requiring an attack roll). Once per turn, when you make a melee or ranged spell attack you can deal an extra 1d4 damage to one creature you hit with the spell if you have advantage on the attack roll. This damage is of the same type as the spell. If you have the Sneak Attack class feature you may also add your sneak attack damage dice.
Feat: Sneaky Spells (perquisite: can cast at least one spell requiring an attack roll). Once per turn, when you make a melee or ranged spell attack you can deal an extra 1d4 damage to one creature you hit with the spell if you have advantage on the attack roll. This damage is of the same type as the spell. If you have the Sneak Attack class feature you may also add your sneak attack damage dice.