Tournament rule 422.6
At high OPL, using sleeves for the Main Deck, Rune Deck and Battlefields is a requirement. At low OPL, using sleeves can be required at the discretion of the head judge.
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At high OPL, using sleeves for the Main Deck, Rune Deck and Battlefields is a requirement. At low OPL, using sleeves can be required at the discretion of the head judge.