You do have 19 targets to get to turn into creatures, which require them to be four or more mana to animate, so making your early land drops is crucial
If the answer is yes, Lumra, Bellow of the Woods should be higher on this list
While value is a big deal in both types of deck construction, immediate value is more important in constructed, while exponential value reigns supreme in casual Commander
It is always a bit awkward with these types of lands that make you choose a color, because sometimes you have to play it earlier and name the color of something you arent splashing, just cause you need a different color of mana, but this still looks like the kind of fixing that will help decks splash stuff I think this land is probably worth running in most decks despite only producing colorless mana at first
As for opening these serialized cards, you can only get them in collector boosters of the appropriate MTG set
I personally feel Sliver Overlord is the best of the bunch, but that's just me