Conjure Servitor

Summons a Goblin, Kobold, Gnome, 

Gnome, has Smith's and Jeweler's Kit Proficiency, Common and Gnomish when upcasted to 4th level, Gnome's gain History Proficiency

Kobold, has Tinker's and Leatherworker's kit proficiency, Common and Draconic when upcasted to 4th level, Kobolds gain investigation proficiency

Goblin, has Weaver's Woodcarver's kit Proficiency, Common and Goblin when upcasted to 4th level, goblins gain stealth proficiency.

when upcasted to level 4, all gain arcana proficiency.

 all Stat blocks:

STR: 10

DEX: 10

CON: 10

WIS: 14

INT: 16

CHAR: 14

The proficiency modifier is increased by upcasting

level 1-3: +2

4-5: +3

6-7: +4

8: +5

9: +6