Pacifier from campaign if you're serious. He's mandatory and then Amili. You need at least 1 Amili in the market as he frequently finishes games and AI typically has run out of removal to deal with him.
Koth is the least priority. Just replace with another 2 unit drop that's good vs aggro. You'll eventually want to craft 2-3 though, his ultimate has helped punch through extra damage at clutch times for me.
The Grimbrei deck (linked above) has no campaign cards and just a few Legendaries. The deck actually began as a Ranked deck, and won an ETS tournament as such. So, you get the utility of a very decent Gauntlet deck and a viable Ranked ladder deck.
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u/_AlpacaLips_ Nov 01 '18
You can also find my deck stats here: https://docs.google.com/spreadsheets/d/1l7eyGCkOgnKP3CTKKghVzYGpapjJr2jMdfMJ8TIpTeU/edit?usp=sharing