Even though Jumbo Cactuar gets ridiculously big once it attacks, whoever guards that escape tunnel apparently doesn't know that - and before combat, it qualifies
As one popular simulator notes, "The simulator tries to match the chances of getting certain cards to real-life packs, but it can't promise they will be exactly the same." Think of it as a highly educated guessone that gets you incredibly close to the real thing but can't account for every variable in a physical print run
It's part of a combo known as the 'Pickles lock,' wherein Brine Elemental is the 'Pickles' and Vesuvan Shapeshifter is the combo piece that copies Brine Elemental turn after turn, preventing your opponents from untapping
It also has a third effect that lets you add it back to your hand from the GV if your Fusion Summoned boss monster gets destroyed
Putting 12+ cards into your graveyard is likely to include one or two Ill-Gotten Gains
You get the most use out of your lands with the fun LCI card, Spelunking which brings your lands into play untapped
