MTG: Pioneer Challenger Deck 2021 – Rules of Play says:
Each Challenger Deck comes with a complete 60-card main deck and a 15-card sideboard, perfect for the next event at your local game store. These decks are intended to be playable and competitive at a local level, ready to challenge friends and foes alike. All cards have been previously printed in Pioneer-legal sets and are legal in the Pioneer format.
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