They're occasionally found in standard Base Set booster boxes - so if you have one you'll have to weigh up whether to gamble on the chance discovery of one of the black triangle booster packs, or whether it's best to leave the box unopened for its pristine value
It often sees play with red rummage cards like Artist's Talent and Tersa Lightshatter as enablers, although blue has plenty of looting effects to make it tick
The front half is a very solid removal spell, while the back half can end the game on the spot if it goes long enough
The key driver: Mew VMAX SA individual card prices have appreciated faster than the box price, meaning the expected value of pulling that card has grown relative to box cost
Fortunately, cards like Acquire or Knowledge Exploitation and artifacts like Ring of Three Wishes or Planar Bridge can help you in a pinch, but these tend to be very mana intensive or situational, so I recommend using them sparingly