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« on: June 20, 2013, 07:52:03 PM »
"When revealed effects" of enchantments do NOT automatically trigger when they are destroyed.
The next update of the FAQ will clarify that "reveal" means only after you take the action of revealing the enchantment and paying the reveal cost, and will reword Decoy to specify that you get the mana back "even if Decoy was unrevealed" when it is destroyed.
The wording in the rulebook about "enchantments automatically being revealed when they are destroyed" just means that when they go to the discard pile you turn them face up so both sides can see what they are.
Note, however, that you can voluntarily reveal enchantments at the end of any step of the attack. For instance, if your opponent has just rolled the dice and the dice show enough damage to kill your creature, you can reveal Healing Charm (and pay its reveal cost) at the end of the Roll Dice Step, trigger the healing effect, and then after that the damage will be dealt, which may no longer be enough damage to kill your creature.