Historical Rules · 27 March 2015
Rule 100.4
Official source text from the 27 March 2015 Rules release
Each player may also have a sideboard, which is a group of additional cards the player may use to modify his or her deck between games of a match.
Historical Rules · 27 March 2015
Official source text from the 27 March 2015 Rules release
Each player may also have a sideboard, which is a group of additional cards the player may use to modify his or her deck between games of a match.