This is because the cards were reportedly a part of a printing test run by Wizards of the Coast ahead of the official launch of the Pokemon TCG
Aggressive decks that play pump spells tend to operate on few lands, so it can be difficult to cast a threat and leave up much interaction on the same turn
After it, the rest of 2026 brings the franchise's 30th anniversary set and one more main expansion, Delta Reign
Fun fact, Panharmonicon only counts artifacts and creatures, whereas Virtue of Knowledge counts any permanent
The rarity of a card can often correlate to its power and utility in battle, making the hunt for elusive ultra-rare cards all the more thrilling for collectors and competitive players alike
Some folks arent a fan of type matters gameplay, so its much easier to pick something else in that case