I have been struggling since last season to win games and it continued until this season. I was frustrated and discouraged as I was relegated to Bronze II while I am using a gold level Chaos Legion deck borrowed from Nfty Arcade. I initially blamed my losses to cards that I don't have like Soulbound reward and Rebellion cards like the battle below.
Daarg Deadblast is a beast paired with Baakjira
https://splinterlands.com?p=battle&id=sl_c35c5492a631203e5b4fd09906661d72&ref=logen9f
To strengthen my deck, I rented cards that I can help me at least reach silver and maybe even gold.
Djinn Oceanus - He is a great tank or secondary tank with 5 speed, Void and Phase skills. I use him when I think my opponent will use mages.
Pelacor Conjurer - At only 2 mana with Flying and Reflect skills is a necessary addition to my Life Deck.
Venari Crystalsmith - With tank heal skill is a good support and damage dealer too.
Arachne Thug - Great offtank which I usually pair with Windeku.
Uraes - A neutral sniper card which has only 3 mana. I can slot him in in any Splinter.
And just like that, the wins came in streaks.
Right now, I'm at Silver 1 but will think about which cards I need to rent to advance to Gold League.