With an arcane point + Unc Rogue + AT+ Precise Strike you're looking @ 6d6 sneak attack (more with Sense vitals and a weapon) AND a +2 extra to hit, AND if you confirm a Crit.. Your team mate with the same feats gets an AoO
Milly Tanner (Twins)
Female human (Varisian) arcane trickster 5/magus (greensting slayer) 4/rogue (unchained) 1 (Pathfinder Player Companion: Bastards of Golarion, Pathfinder RPG Ultimate Magic 9, Pathfinder Unchained 20)
N Medium humanoid (human)
Init +2; Senses low-light vision; Perception +13
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Defense
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AC 12, touch 12, flat-footed 10 (+2 Dex)
hp 72 (10 HD; 5d6+5d8+24)
Fort +8, Ref +8, Will +7
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Offense
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Speed 30 ft.
Special Attacks magus arcana (close range[UM], spell blending [1 spell][UM]), sneak attack (unchained) +1d6, sneak attack +3d6, spell combat, spell recall, spellstrike
Magus (Greensting Slayer) Spells Prepared (CL 9th; concentration +13)
2nd—mirror image, scorching ray, sense vitals (2)
1st—chill touch (DC 15), ray of enfeeblement (2, DC 15), shocking grasp, vanish[APG] (DC 15)
0 (at will)—acid splash, detect magic, mage hand, prestidigitation, read magic
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Statistics
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Str 14, Dex 14, Con 14, Int 18, Wis 10, Cha 14
Base Atk +5; CMB +7; CMD 19
Feats Accomplished Sneak Attacker, Combat Expertise, Extra Arcana[UM], Fast Learner[ARG], Outflank[APG], Precise Strike[APG], Weapon Finesse
Traits blood of dragons, killer
Skills Acrobatics +15, Bluff +6, Climb +6, Diplomacy +6, Disable Device +16, Disguise +6, Escape Artist +9, Knowledge (arcana) +15, Knowledge (local) +11, Linguistics +17, Perception +13, Spellcraft +17, Stealth +15, Use Magic Device +15
Languages Aquan, Auran, Azlanti, Common, Draconic, Ignan, Kelish, Osiriani, Sylvan, Terran, Thassilonian, Varisian
SQ arcane pool, impromptu sneak attack, ranged legerdemain, trapfinding +1, tricky spells
Other Gear 110 gp
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Special Abilities
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Arcane Pool (+1d6 sneak attack, 6/day) (Su) Expend Arcane Pool to add sneak attack dmg to next melee atk.
Close Range (Ex) Using spellstrike, deliver ranged touch spells as melee touch spells.
Combat Expertise +/-2 Bonus to AC in exchange for an equal penalty to attack.
Impromptu Sneak Attack (1/day) (Ex) You can declare any melee or ranged attack to be a sneak attack.
Low-Light Vision See twice as far as a human in dim light, distinguishing color and detail.
Outflank Increase flank bonus by +2 if flanking ally has same feat. If you crit, ally gets an AoO.
Precise Strike +1d6 precision damage for melee attacks if you and an ally with this feat flank the same target.
Ranged Legerdemain (Su) Can use Disable Device or Sleight of Hand from 30 ft away, but +5 DC.
Sneak Attack (Unchained) +1d6 Attacks deal extra dam if flank foe or if foe is flat-footed.
Sneak Attack +3d6 Attacks deal extra dam if flank foe or if foe is flat-footed.
Spell Combat (Ex) Use a weapon with one hand at -2 and cast a spell with the other.
Spell Recall (Su) Spend your Arcane Pool to recall spells you have already cast.
Spellstrike (Su) Deliver touch spells as part of a melee attack.
Trapfinding +1 Gain a bonus to find or disable traps, including magical ones.
Tricky Spells (3/day) (Su) You can cast a spell without verbal or somatic components.