Goblins are usually not viewed as a good troop for getting Trophies, however they can be useful in small amounts. ... Also, Goblins can be useful at the end of attacks. If you didn't get to 50% and all your other troops died, you may be able to use Goblins to destroy a few mines and collectors to get you over 50%.
Is Sneaky goblin good?
They form a good alternative to regular Goblins when farming loot; their higher health allows it to survive slightly longer (for instance, it is able to survive a single hit from a Mortar) Because of their invisibility, a single Sneaky Goblin is often sufficient to destroy an exposed Gold Mine or Elixir Collector.
How much do goblins cost to upgrade?
Training cost increases to 40 elixir. A Level 3 Laboratory lets you upgrade goblins to Level 3, which means 36 hit points, 19 standard points of damage, and 38 points when attacking resources. Upgrade cost is 250,000 elixir and takes 2 days.