While commons might not come to mind when you think of valuable cards, quite a few are worth a pretty penny, particularly those from older sets
With the set spanning over 200 cards, spanning characters, actions, songs and more, it can be tricky to know where to start when it comes to picking out the best Disney Lorcana cards for your first deck
Somewhat related, part of what has encouraged me to look at a more combo oriented list is the 3+ color "good stuff" deck building problem (defined as just grabbing powerful cards and jamming them into a deck with no real archetype focus)
Saryth, The Viper's Fang can even tap itself and pay one generic mana to untap another creature or land
Blue Suns Zenith Blue Sun's Zenith is another blue card thats just too fun not to play but also fits this theme
This four mana 4/3 Berserker will trigger when another dork you control dies