Do you keep all your Pendulum cards in your deck or your extra deck? Since you need to draw two Pendulum cards to set the scale, how are you supposed to draw them if they are in your extra deck?

Answer

They go in your main deck. However, when they're destroyed, instead of going to the graveyard like other monsters, they instead go to the extra deck (and can exceed the standard extra deck limit of 15), where they can be Pendulum summoned as if they were in hand.

Setting scales requires Pendulum cards from the hand, so it helps to have some backup scales in hand in case a fielded one gets destroyed.

Updated on May 7, 2018

Original Article:

Yu-Gi-Oh: A Defense for (and Explanation of) Pendulum Summoning
By Jeremy Gill
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