To double the number of a kind of counters on a player or permanent, give that player or permanent as many of those counters as that player or permanent already has.
April 27, 2018 · Dominaria
If a card in one zone is exchanged with a card in a different zone, and either of them is attached to an object, that card stops being attached to that object and the other card becomes attached to that object.
September 30, 2011 · Innistrad
rule 701.10e not present in this release
June 17, 2011 · Commander 2011
Previously, the action of using an activated ability was referred to on cards as “playing”
April 1, 2011 · Duel Decks: Knights vs. Dragons
Previously, the action of using an activated ability was referred to on cards as "playing" that ability. Cards that were printed with that text have received errata in the Oracle card reference so they now refer to "activating" that ability.
February 4, 2011 · Mirrodin Besieged
Previously, the action of using an activated ability was referred to on cards as “playing” that ability. Cards that were printed with that text have received errata in the Oracle card reference so they now refer to “activating” that ability.
October 1, 2010 · Scars of Mirrodin
Previously, the action of using an activated ability was referred to on cards as “playing”
February 1, 2010 · Worldwake
Previously, the action of using an activated ability was referred to on cards as "playing" that ability. Cards that were printed with that text have received errata in the Oracle card reference so they now refer to "activating" that ability.