Yes, its pretty easy to break Goloss activated ability, but thats true with a lot of cards that are legal in Commander, and I also think plenty of people build their Golos deck just for value
While its stats make for an underwhelming attacking Creature, especially in a typically aggressive color combo like Boros, this Creature is much more useful as a utility pick thanks to its tap ability
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Even if youre not getting the life gain, you do get to draw for however many creatures you have in play, making this an easy hand refill in most decks
As a result, it's often better to let an attack through rather than risk losing Prosper to a post-combat removal spell or combat trick