I haven't made it out of the Gold league in I can't tell you how long. I used to be able to make it to Diamond 1 pretty easy. I might have even made it to champion once or twice, but I can't really remember. I'd love to be able to push into Diamond again but like you I am not great at the strategy and not all of my cards are maxed.
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Worth renting, especially if you can offset the cost with your own rentals :)