While the main deck uses pendulum summoning to bring big monsters out onto the field, the extra deck contains synchro, fusion, XYZ, and link monsters
Once you have those, you can slowly add the other pieces, improving the deck with each new addition
Just by being on the battlefield, you shut down a good portion of graveyard synergies your opponent could play by exiling any creature that would die
Each store has their own pricing and, with the surge in popularity for all TCGs following the COVID-19 pandemic, even outlets like Book-Off, known most notably for their wide array of second-hand books, CDs and video games, have their own collection of rare cards on display
Personally in this list, I opted to utilize Dinomist Rex as my small world bridge, as at worst it's a level 5 pendulum monster with a six scale to utilize as a high scale or pendulum summon to use as link material
Now if this is so strong, why is she so low on the list