Shadowverse

Standard advice - go play unlimited; I've barely changed my decks there since the release of bots, easily crushing everyone with 7 out of 8 classes.
Actually, I'm waiting for the rotation meta to settle down so I can craft some proper legendaries from the latest expansions, but it's possible I'll just spend most of my time in unlimited.

And the meta there is pretty decent. Dragons and portal users were there too, for what it's worth.