what is a extra deck in yugioh Top 10 Pendulum Monsters "Yu-Gi-Oh" Extra Deck Zone | Yu-Gi-Oh!

The Dark Side of Dimensions Movie Pack: Secret Edition The Dark Side of Dimensions Movie Pack: Secret Edition(Yu-Gi-Oh!)(),TCG Stacked $95.92 63 The Dark Side of Dimensions Movie Pack: Secret Edition 1Blue Eyes White Dragon$12.34Secret Rare 2Neo Blue Eyes Ultimate Dragon$8.84Secret Rare 3Dark Magician Girl$8.25Secret Rare 4Berry Magician Girl$6.47Secret Rare 5Chocolate Magician Girl$5.67Secret Rare 6Blue Eyes Chaos MAX Dragon$5.62Secret Rare 7Dark Magician$5.21Secret Rare 8Palladium Oracle Mahad$3.32Secret Rare 9Apple Magician Girl$3.21Secret Rare 10Lemon Magician Girl$2.68Secret Rare

With this, many cards hit the spotlight, including the intensely powerful Lucario ex card

Protect your monsters and life points with an arsenal of defensive spells and traps, such as Gravity Bind, Level Limit - Area B, and Threatening Roar

Weakness: Grass (x2) Resistance: none Retreat: 3 #28

It also works great in multiples and I think has a number of applications for control and midrange-based decks