I realize this is all contextual and hero-dependent, but I'm just trying to get a general baseline understanding of what great late-game builds look like for each tribe.

I'm familiar with deathrattle beasts, pirate exodia, taregosa scaling divine shields for dragons, but I'm never really quite sure what I'm supposed to be doing with demons, quillboar, naga, and elementals late game. I feel like I kind of fumble around with trying to figure out what minions are best to buy, and that's why I'm kinda stuck at 6.5k for about a month now.

Is there a resource that lists out the best strategy for each tribe and what the best lategame builds generally look like?