I've reached rank 80 and need help

So last season I reached rank 80 towards the end my previous highest was around 60, I quickly reached rank 80 this season after the rank reset I've been stuck losing ever since. I've dropped to 77 because I just keep seeing Galactus In different deck compositions most games or they just have the counter for the deck I'm using. I have most of the important series 3 cards except for debrii. Are there any good decks to use at this rank?