I feel this way too. I didn't mind a lower power standard because I always had Modern (and then Pioneer) to go to. Admittedly I came in around SOI block and that was a very weak standard, but I thought the best time was during GRN/RNA block when there were so many decks that felt very strong and synergistic but not busted. I suppose they feel like casual Commander fills this void now
MysticKetchup
I think their ubiquity and simple rules make basic lands good for more adventurous art design. That being said, this one is not really up my alley (I do however love the Nyx and Planet basics). I'm glad they have the Dragon's Presence basics for a more traditional style of full art lands though
Haughty Djinn was originally printed in DMU, and given that Dominaria has a long history of Djinn going back to Alpha, Smirking Spelljacker is probably from there. Older Djinn didn't really have a cohesive visual identity, but comparing it to djinn from the more recent Dominaria sets, it seems to match up
Out of all the Djinn in Magic, only two other in-universe planes have had Djinn, Ravnica and Strixhaven. Strixhaven is the other possibility, but Spelljacker looks pretty wispy which would align more with Dominaria
10 copies is a really small amount, I would have thought they'd have a bigger stock for something like this.
Just wish they would just go back to print-to-demand SL. I've just tuned out SL releases now since I know I won't have a chance to get something if it's actually popular