Historical Rules · 1 April 2011
Rule 100.4
Official source text from the 1 April 2011 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 April 2011
Official source text from the 1 April 2011 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.