Ideally, your sideboard prepares you for whichever decks are most popular at the moment
Thankfully, Wizards of the Coast invited me to preview what would be revealed at the convention, which included a timeline of 2027s products and events: I asked lead Magic designer Mark Rosewater why upcoming underwater plane, Nauctis , wouldnt focus on Blue mana, as 2002s Torment focused on Black
I can see Laughing Mad being desirable with the right setup, given that some cards care about the amount of mana spent on a spell, but I dont think that will happen too often
Penance, an enchantment that many are likely unfamiliar with, is seeing a price spike
Collectors are also responding to the Rocket branding and unique artwork, which makes the SIR version particularly desirable
This looks like the next big lands staple for Commander