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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

What are those cards

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

Once you have those, you can slowly add the other pieces, improving the deck with each new addition

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