bare in mind my answers are only derived from the point of view of absolute, top end competitive decks, and as such are badly coloured. Creativity can win things as much as tuning in some cases.
In the 300-400 and up a bit, absolutely you can win, there's plenty of bad decks and bad players around there; and you sound like you know what you're doing if I may say so, so you're going to have a fine chance at the non-bad ones too. Even if I disagree with your deck composition your reasoning is 100% sound. In the mid 400s when you start to run into ultra-tuned Zaladars and Borises, and more unconventional decks, is where you'll have trouble I think. Though never underestimate the power of the fact that your opponent will not expect half of the cards you're playing
Plasma Behemoth absolutely can compete, the deck I told you to look at is just one version of it. He just has a different play associated with him.
Honestly after reading two of your posts I'd say ignore my initial advice and keep playing your deck, and find your own modifications/tweaks to it. If you end up with a similar deck to the cookie cutter top level styles, so be it; but you might just end up with something better, or keep your unpredictability factor as an advantage.
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