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602.3.d. Limited decks can use battlefields from their provided card pool or any number of "blank" battlefields. Players may opt to use “blank” battlefields in place of battlefields they received in their provided card pool.

602.3.d.1. “Blank” battlefields function as battlefields that do not have any rules text. Otherwise, they adhere to all other normal battlefield rules as defined in the Core Rules.
602.3.d.2. At low OPL, “Blank” battlefields can be represented by anything agreed upon by all players in the game.602.3.d.2.a. At high OPL, “Blank” battlefields must be represented by any official Riftbound card, put in an opaque card sleeve with the cardback facing outwards.