Prepared spells are remaining available to players after the prepared creature has left the battlefield
Opponent had Quill-Blade Laureate on the battlefield with its prepared spell Twofold Intent available to cast. He then cast daydream targeting his Quill-Blade Laureate. This caused a second copy of Twofold Intent to become available for him to cast. The first should've become unavailable when the creature left the battlefield.
I have also seen this happen when creatures died and were reanimated, but I cannot recall the exact cards in play.
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hurfaderfa#89168
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