Stella Lee can be built both ways
In that clip, Rachel Weeks draws specific attention to the card's low price tag (at time of filming), but also states that "it might go up out of nowhere"
The Loyalist is probably the weakest of the bunch but has a tradeoff for removing it and is quite flavorful
Witch-king, Bringer of Ruin picks off the smaller creature from defending players when attacking, but if the battlefield has been swept a few times and the only creature youve been able to cast is your commander, that can be a bit oppressive
Without considering Backgrounds, hes smack-dab in the middle
When you go to drop your own Dockside Extortionist you are either forcing your opponents to sacrifice their Treasure tokens early in response, or they will be giving you a ton of Treasure tokens of your own