They aren't going away, obviously, but it's pretty safe to say they didn't come at no cost
While resolving Kefka, Court Mage's last ability, the next opponent in turn order chooses a permanent they control, then each other opponent in turn order does the same
This makes them an easy swap for a basic land
This is the enhanced expansion pack () format, which differs from standard 30-pack expansions like S11 or S12
Expansion may only be able to copy smaller spells, but you can use the Explosion side to pull you miles ahead on the spot
However, there are those who say (and here it may be a majority opinion) that the effort is not worth it, as the prize pool at the end of the season can be mediocre compared to the time dedicated to staying in the Mythic and, even so, being in the Mythic you may not be ranked high enough to be invited to an event