In fact, he is one of several useful Stage 2 Water types, so he would be at home in a deck based around Archies that picked out the right Water Pokemon (Empoleon, Swampert, Blastoise) for the right situation
If that creature isn't a Goblin, it becomes a Goblin in addition to its other types
2 Harpie's Pet Dragon Effect Monster Card Dragons are one of the most prevalent monster types in Yu-gi-oh
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Recent additions for this archetype include Hexing Squelcher and a disruptor and direct damage, Goblin Welder as an artifact combo waiting to happen in lower mana curve decks, and Cori-Steel Cutter for decks that can multi-spell easily
And bouncing has a lot of flexibility as a way to survive removal or blocks, adding a useful tempo element, reloading a creature with a powerful enters-the-battlefield trigger, dealing with auras and so much more