That means you'll be able to play one less land that turn, and you can't play it if you've already used up all of your land drops for the turn
By the end of the month, after consulting with Aaron Forsythe and many, many other wonderful coworkers, we had a plan: we were going to do a set size that had never been done before
This is because theyre full art cards that showcase Galarian Pokmon which were introduced in the video game Pokmon Sword and Shield without Trainers also featuring
Everything else on it is alright (Her giving anything with a tail a +1/+1 counter shows that She's "Caring" for the "Animals," and her having Stare down basically be "The Stare." is VERY in character, I believe)
My guess would be that Wizards was worried about Carnage Tyrant being too dominant in Standard and decided that Isolation Tower would be a good safety valve just in case, although it's fun to imagine that Wizards hates Modern Bogles as much as I do and decided to stick it to the untargetable one-drops Slippery Bogle and Gladecover Scout
Could also be the mythic uncommon of the set (though these are harder to predict)