Those are really nice teams, Debris, thanks for the post!
For myself, I lost one match last week where I failed to adequately "counter" the opposing troops, so with my more limited options and my amateur matching skills I've been working more towards trying to counter and then work in the colors as I can, usually two is the most I can work in with confidence, but will stretch to three when I can. For example, for Red last week when facing a Bone Dragon team I was able to use Hellcat, Alchemist, Goblin Rocket, Goblin Rocket, which I was also able to use a bit today for Yellow, since it was not only 3 red but also 3 yellow. It is not fast but it has worked for me against appropriate opponents.
Red - Hellcat, Alchemist, Goblin Rocket, Goblin Rocket
Yellow - Hellcat, Alchemist, Goblin Rocket, Goblin Rocket
For my last opponent today, the top tough high point match, I felt I had to unfortunately drop down to just one Yellow to beat what looked like an intimidating Scale Guard Naga poison team, so I was trying to work in poison resistance and true damage, as well as some mana stealing. With the yellow troops that I had available Gorgotha was the only one that came to mind that I felt confident enough to put on the team, which I suppose is one of the reasons that Guild Wars is so interesting, trying to fight teams that are tougher that I usually would pass on in PvP, while trying to mix my available troops with the preferred color of the day. I wanted to put Shadow Dragon in there, but just didn't feel confident doing it.