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And Prismatic Evolutions

When the VRAINS world launched, the skill was buffed again to let players move Pendulum Monsters out of the Extra Monster Zone to make Pendulums easier to play with the rule updates

the rest is pure gravy

Though there are more types of double faced cards and other rules mostly to do with various other keywords and the way they can affect the handling of double faced cards the above will cover you for learning how to incorporate cards in your deck, along with the basics of how they work