The best replacement for goblin is gnomish engineering.

The best alternatives to goblin are rated as following:
★★★★★  gnomish engineering
★★★★  gnome engineering
★★  gnomish
★★  gnome
★★  hobgoblin
★  orc
★  worgen
★  orc warlock
★  elves
★  orc shaman
★  undead warlock
★  undead rogue
★  gnomish engineer
★  troll
★  troll mage
  gnome engineer
  spiderman
  gnome engineering wow
  spider man
  martians
  gnomish eng
  gnome engineering for hunter
  joker
  troll shaman
  bugbear
  gnomish engineering wow
  elf
  new goblin
  sandman
  troll priest
  doc ock
  green goblin
  venom
  undead mage

Your alternative for goblin is not listed? Suggest!
Speaking about goblin, one probably shouldn't forget about battle ravaged spider man.

Other search terms related to goblin and their ratings are:
★★★★★ battle ravaged spider man
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Google Trends

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goblin
gnomish engineering
gnome engineering