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In theory, there could be decks that don't want Glasspool Mimic (ones that have almost no creatures), but even with just a handful of creatures worth copying in your deck, it's significantly better than the Island it will likely replace
Frozone Super Slick serves the same purpose, and his Evasive keyword will be useful early on
Id pair it up with Sword Coast Sailor, then use buffs like Sword of Light and Shadow and other favorite Equipment in order to both get it through rough combats and tick up what he goads
That set had about 50 cards, whereas this release had double the number
Oh, and keep in mind that Backup transfers all abilities below it