Interesting rules question. A wizard has an opponent's face down enchantment underneath him. He holds his quick spell for that first quick cast phase.
During the action phase, before his first action, he chooses to cast seeking dispel on the face down enchantment using his quick cast marker. His opponent wishes to reveal magebane after the quick cast marker is flipped, but before the dispel is announced.
Is that a legal time period to reveal an enchantment? Rules say after any action or event, but I do not know if using the quick cast qualifies. If it were cast using an action, there would be a time period during activation, but this is a quick cast using the quick spell marker.