Historical Rules · 17 June 2011
Rule 100.4b
Official source text from the 17 June 2011 Rules release
In limited play involving individual players, all cards a player opens but doesn't include in his or her deck are in that player's sideboard.
Historical Rules · 17 June 2011
Official source text from the 17 June 2011 Rules release
In limited play involving individual players, all cards a player opens but doesn't include in his or her deck are in that player's sideboard.