Those are pretty much the first cards that I bought when I started playing SL.
The only one I'm not really into is the Elven Cutthroat. Maybe I'll give it a shot.
I don't really know why, but I haven't played the Sand Worm much, but I'll change that.
the elven cutthroat would do better when it's lvl5 since the melee damage will change into 2 melee damage. for sand worm, it more likely kills squishy units from the back since it has a whooping 5melee damage