As long time Magic player, I can say that Pokemon has had an influence over the game over the past few years. If I were to say anything, the Collectability of a Magic card is the playability of a Magic Card. A lot of people, such as myself, get cards for our arsenal since we always are in the thought process of “we might need this for a deck later.” The mentality of this is completely different from Pokemon. However, nowadays, WotC is catering to the collector crowd with Secret Lair, Collaborations (like Godzilla and Dracula), and the new Collector’s Boosters.
As far as collecting MtG, yes, Power Nine is the grail. They are uber powerful, but in Magic, we also have something called the reserve list (sorry if somebody brought this up already). Basically, there are cards that can’t be reprinted. For the most part, they can’t even be functionally reprinted (the closest they got was probably the Ixalan MDFC Lands). So, for the equivalent of Vintage Pokemon cards, the reserve list is what you want to collect.
Now, if you just like the art, I think lands are the best. Even basic lands. I think they have the best art in Magic: the Gathering. Then, I think next you go to the fantasy realm and the art of Angels, Dragons, Demons, and other fantasy tropes are nice. I personally like having cards like Wrath of God and Damnation next to each other.
However, I have a conundrum. I am changing up the display behind me to have cards, and even though I am more a Magic player, there is nothing I could really thing of displaying for Magic: The Gathering. Do I display something because it means more to me? Well some of those cards don’t make good displays. Do I display lands? Well… they are just lands… In Pokemon it’s easy. New Eeeveelution VMAX alt arts? Damn, those look nice. I’ll display them. I don’t have power nine, so there isn’t really any show stoppers or talking points I would display.
What I will say, is thank god for 12 pocket pages because Magic: The Gathering cards look great in binders since you always want a playset of 4. Again, because of the “I might play this later” mentality. Me personally, I’m collecting dual land sets (Fetches, Shocks, Fast, etc.).
Now cool modern things to collect in MtG, in my opinion, are the following:
-Japanese War of the Spark Planewalkers (I wish I had the funds to get them in foil)
-Ikoria Box Toppers (The Godzilla Cards)
-Strixhaven Mystical Archives (I like both Japanese and English versions)
For vintage, Reserve List for sure.
I’m sure Japan will get more exclusives since it is a huge market for Magic: The Gathering.