Spider is a series of Insect monsters used by Roman Goodwin in Yu-Gi-Oh! 5D's and Kyoji Yagumo in Yu-Gi-Oh! ZEXAL manga. Only a few of the Spider monsters appeared in Roman's Deck in the anime; the others were introduced alongside them in Stardust Overdrive and Absolute Powerforce.
"Underground Arachnid" appears as a character in Yu-Gi-Oh! 5D's World Championship 2010: Reverse of Arcadia.
Their effects revolve around changing the opponent's monsters into Defense Position and taking advantage of the opponent's monsters while they are in that position. Position changing cards such as "No Entry!!", "Stumbling", "Curse of Anubis", "Koa'ki Meiru Beetle", and "Security Orb" serve to make their effects easier to activate. Since some of their effects also rely on having a certain number of Insect monsters in your Graveyard, "Foolish Burial" and even self-milling, through cards such as "Needlebug Nest", "Destruction of Destiny", "Magical Merchant" and the "Lightsworns" might also prove useful as well.
Aside from anti-Insect support such as "Insect Barrier" and "Eradicating Aerosol", this Deck is useless against any Deck that uses "Final Attack Orders". This Deck can also be stopped in its tracks by cards such as "Necrovalley", "Dimensional Fissure", and "Jinzo" which will prevent you from receiving the effects of your cards that target Insects in the Graveyard. This latter issue can be buffered with piercing and beatdown monsters, as "Spider" monsters have highly run-on-the-mill ATK/DEF that without Spell/Trap support, are easily subjugated.