Many goblins either create more goblins when they enter the battlefield, like Siege-Gang Commander, or have buffing effects, like Hobgoblin Bandit Lord
The Necrobloom is grindy, explosive, recursive, and absurdly rewarding to build around, which is why it earns the top spot on this list
Un-sets celebrate Magics more playful side, featuring cards with zany mechanics that push the boundaries of what players can do in a Magic game and jokes that poke a bit of fun at the game itself
Trawler sees play as an answer to graveyards and another utility goblin that you can fetch up
You want to hit your land drops anyway, so a cheap blocker that generates effectively free value is very welcome in a strategy that needs to churn through 60 cards rather than 20 life points