Goblins is one of the few viable tribal decks in the format with both a bunch of different goblins and a lord to rule them all. The deck usually looks a lot like the Sligh deck but instead of going for the perfect mana curve you go all in on goblins and a playset of Goblin King. The best red goblins that you always see in these decks are Goblin Balloon Brigade and Goblins of the Flarg. The reason why they are better than the rest is because both of them have evasion of some sort.
Other goblins you can use are Mons Goblin Raiders, Goblin Digging Team and if you want to splash a color you also have access to Scarwood Goblins and Marsh Goblins. Besides the obvious Goblin King you can also use Gauntlet of Might, Goblin Shrine and Goblin Caves to strengthen you goblins.
If you splash green you can also use Pendelhaven to make your goblins more powerful.