Krawler is one of the 7 "World Legacy" archetypes. It uses Flip Effect monsters in order to destroy the opponent's cards, summon more monsters, etc. The Link Monsters have effects that help to enhance the rest of the "Krawler" monster's ATK and DEF, and the good thing about the Link Monsters, is if they leave the field due to an opponent's card effect, you can Special Summon more "Krawler" monsters from the Graveyard to take their place!
https://youtu.be/MN2XNiZHUac
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