The foremost words that come to mind when reflecting on Vance Moore's Odyssey are many: unnecessary, repetitive, and--most of all--unpleasant.
But, perhaps more important than those is this descriptor: unfocused. The novel is ostensibly focused on the world of Otaria (set in Magic's original setting, Dominaria) and on the main protagonist, Kamahl. However, Otaria's main draw (pit fights) and any sort of characterisation that Kamahl would receive are completely thrown to the backseat as we focus, unfortunately, on Laquatus, Kirtar, Turg, and a myriad of other extremely unimportant characters. The main McGuffin of the book, the Mirari, is never truly explained or detailed; in fact, its name is unspoken throughout 90 percent of the novel. Having read the entire thing, I still couldn't tell you what it does or why any of the characters care about it.
Through the various misadventures of the horribly unedited and (again) unpleasant prose, we repetitively read through descriptions of animal slaughter, casual murder and torture by our ever-so-unlovable Laquatus, and unbelievably dull depictions of uninteresting, unchanging, filler-ific merman politics.
Skip this book. It has nothing of the spark that makes Magic: The Gathering or its worlds so interesting, fails to even be readable high fantasy, and flounders about in its attempts to make itself sound smart with $10 words and laughably faux-high minded 'intrigue'.