Immediately after the cleanup step begins, if the active player’s hand contains more cards than their maximum hand size (normally seven), they discard enough cards to reduce their hand size to that number. See rule 514.1.
October 7, 2022 · Unfinity
Immediately after the combat damage step begins, each player in APNAP order announces how each attacking or blocking creature they control assigns its combat damage. See rule 510.1.
November 19, 2021 · Innistrad: Crimson Vow
Immediately after combat damage has been assigned during the combat damage step, all combat damage is dealt simultaneously. See rule 510.2.
May 3, 2019 · War of the Spark
Immediately after the cleanup step begins, if the active player’s hand contains more cards than their maximum hand size (normally seven), they discard enough cards to reduce their hand size to that number. See rule 514.1.
January 25, 2019 · Ravnica Allegiance
Immediately after the cleanup step begins, if the active player's hand contains more cards than their maximum hand size (normally seven), they discard enough cards to reduce their hand size to that number. See rule 514.1.
April 27, 2018 · Dominaria
Immediately after the cleanup step begins, if the active player’s hand contains more cards than their maximum hand size (normally seven), they discard enough cards to reduce their hand size to that number. See rule 514.1.
May 1, 2014 · Journey into Nyx
Immediately after the active player has discarded cards (if necessary) during the cleanup step, all damage is removed from permanents and all “until end of turn” and “this turn” effects end. These actions happen simultaneously. See rule 514.2.
September 30, 2011 · Innistrad
Immediately after the active player has discarded cards (if necessary) during the cleanup step, all damage is removed from permanents and all "until end of turn" and "this turn" effects end. These actions happen simultaneously. See rule 514.2.
June 17, 2011 · Commander 2011
Immediately after the active player has discarded cards (if necessary) during the cleanup
April 1, 2011 · Duel Decks: Knights vs. Dragons
Immediately after the active player has discarded cards (if necessary) during the cleanup step, all damage is removed from permanents and all "until end of turn" and "this turn" effects end. These actions happen simultaneously. See rule 514.2.
February 4, 2011 · Mirrodin Besieged
Immediately after the active player has discarded cards (if necessary) during the cleanup step, all damage is removed from permanents and all “until end of turn” and “this turn” effects end. These actions happen simultaneously. See rule 514.2.
October 1, 2010 · Scars of Mirrodin
Immediately after the active player has discarded cards (if necessary) during the cleanup
June 18, 2010 · Archenemy
Immediately after the active player has discarded cards (if necessary) during the cleanup step, all damage is removed from permanents and all "until end of turn" and "this turn" effects end. These actions happen simultaneously. See rule 514.2.
February 1, 2010 · Worldwake
When each step or phase ends, any unused mana left in a player's mana pool empties. See rule 500.4.