Historical Rules · 1 May 2014
Rule 100.4
Official source text from the 1 May 2014 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 · 1 May 2014
Official source text from the 1 May 2014 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.