From MTG Salvation Wiki
APNAP stands for Active Player, then NonActive Player. When an effect lets more than one player do something at the same time, the active player will make and announce all decisions necessary for the action first, then the nonactive player(s) will do the same in turn order, and finally all of the actions will tale place simultaenously.
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Example
- Mind Swords says "Each player removes two cards in his or her hand from the game." The active player (who probably cast the Mind Swords, since it is a sorcery) first take two cards from his or her hand, without revaling them to the opponent(s). Then, each opponent in turn will also take out two cards. After all have chosen this way, all of the cards are revealed and removed from the game at the same time.
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APNAP also applies when the rules or an effect require several players to do something that can't all be done at the same time. If multiple triggered abilities are waiting to go on the stack when a player would receive priority, the players will first put their triggered abilities on the stack in APNAP order. Since the stack resolves in reverse order, this means the active player's triggers will resolve last.
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Example
- When the turn starts, the active player controls a Masticore ("At the beginning of your upkeep, you may discard a card. If you don't, sacrifice Masticore") and the nonactive player controls a Black Vise ("At the beginning of the chosen player's upkeep, Black Vise deals X damage to that player, where X is the number of cards in his or her hand minus 4.") affecting the active player. The active palyer will not be able to discard for teh masticore's ability before he or she takes damage from the Black Vise.
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