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It's powerful because it has nasty potential depending on the cards you pair it with

Relinquished Anima is also good for getting a Dark Spellcaster on the board for strategies that need it for Link climbing into stronger monsters by freeing up space on the board

There is no targetted one mana discard either as your aim is to kill with tempo before they can ruin your day with anything too serious

Karn, the Great Creator got printed and became a popular card in Modern after Krark-Clan Ironworks was banned

There are plenty of creature-based strategies to choose from, or tons of combos to build around to maximize the chaos Goblins bring to the table

I prefer Protection Racket in my drain focused decks, but you may decide to find room for Black Market Connections as an alternative