Honestly speaking though at 4 to 5k rating range, it’s not hard to push for a top 4 finish. Mech is super consistent but anything goes. Turn 2 and 5 level turn 3 and 4 and 5 have 0 reroll most of the time. Grab the most value minion you see, I like rat pack, kaboom bot and spawn of nzoth the most. Turn 6 have 2 rerolls, and grab 2 best minions you see. No need to be cobalt guardian just what ever good is given to you. Turn 7 is assessment time. Is my board strong? Can I afford a bit of damage? If yes, just go tier 4 and grab the best unit you see. Maybe you can sell one weak unit and roll at T4 once but don’t be greedy. At T4, look at your comp and think what synergy is this comp going, time to roll more for more key cards. Even if it’s hybrid it’s still fine. Cobalt just need a harvest golem to support it.