First, I wanted to review some sites, which could help analyzing data for GU players, but eventually this became my comprehensive collection of GU related sites. Many you may know already, but for the sake of completeness, I included them. Maybe some newer players don't know about them yet.
GUdecks
The single most important site for you, if you play GU a lot. Here you can browse meta decks, create your own, and share the deck codes for easy import, amongst other things.
Also, you can follow your progress in Weekend Ranked event. (Showing my most unimpressive results, had no time to play 🙈)
TokenTrove
In my opinion, a better place to trade cards than IMX. However, it is still lacking a bit on the amount of filters compared to IMX marketplace.
GUstats
This site is also good to track Weekend Ranked event stats. However, the BOTG event tracker still runs here, even after the event ended (not really an issue yet). The matches counted toward WR are highlighted too. And a minor thing, here you can see your all time losses, so you can calculate your overall winrate.
There is also a card prices tab. You can filter for shine rarity. The prices are in both ETH and GODS. The Compare and Cheaper In columns are a nice touch to see how big is the difference between ETH and GODS prices.
Cardsunchained
A site packed with a lot of information. Card prices, most played cards, ans awesome filters. It's worth a look to play around a little.
GUTools
Great site to use. I will not write about it, because 
GUforge
I wrote a post about it a while back: @buzzgoblin/guforge-com-another-tool-for. Since than, it became even better.
I hope some of you may find useful information here.
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