Historical Rules · 1 February 2012
Rule 100.4b
Official source text from the 1 February 2012 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 · 1 February 2012
Official source text from the 1 February 2012 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.