Rulings

• 2009-10-01
  Each creature returned to the battlefield by All Hallow's Eve enters the battlefield under its owner's control.
• 2009-10-01
  All Hallow's Eve's triggered ability functions from the exile zone. This ability has an "intervening 'if' clause." It won't trigger at all unless All Hallow's Eve is exiled and has a scream counter on it (which can happen only if it resolves as a spell).
• 2009-10-01
  The only thing that happens when All Hallow's Eve resolves is that it's exiled with two scream counters on it.
• 2008-04-01
  A "creature card" is any card with the type creature, even if it has other types such as artifact, enchantment, or land. Older cards of type summon are also creature cards.
• 2007-02-01
  This card is once again a sorcery, and its ability looks very much like suspend (although it doesn't have the suspend ability.
• 2004-10-04
  Since you can respond to triggered abilities, it is legal to sacrifice creatures using some spell or ability prior to resolving the ability that removes the final counter from All Hallow's Eve.