i rly hope people will find their own way to build a good team
I mean, you can shut your eyes and play PvE to your heart's content, doing your own teams as you like - but for PvP there will definitely be compositions that are stronger than others... and people will figure it out, just like the constructed meta.
And people will copy them. And there will be a tab on this site you can click and see all the best builds.
This tier list assumes a single card vacuum, but with the rock paper scissors style of weakness things get a bit more complicated. For example this list has Tavish Stormpike as a C tier but he is an MVP in my pvp team. Almost everyone uses casters, and often a majority since they have access to a lot of AOE. So his traps trigger almost every turn, with flame trap dealing double damage to casters.
Also Varden Dawngrasp as a B tier? That's at least an A. AOE damage and AOE slow is massive in pvp.