Play them in companion decks like Keruga, the Macrosage because you can have lots of cards with mana value of 3 or more that are also lands, thus fulfilling the companion condition
Because you get to choose who gets to draw with you, you can make a short-term alliance with one player, protecting you for a few turns or forcing another player to spend a coveted counterspell to put a stop to it
As of writing this post, there are 892 unique Pokemon
Let's add another Cheren and two more Catchers
Simply put, theres not a lot of it out there and that has made what is fairly expensive
Parun has the ability to deal 1 damage whenever you draw a card, which is excellent given the next ability draws you cards whenever anyone casts an instant or sorcery