Herald's Horn
I copied Herald's Horn with The Mycosynth Gardens. Herald's ability is to choose a creature type when it ETBs, not when it is cast. So once I created a copy it should have let me choose a creature type or just defaulted to the one already chosen. Instead it did neither.
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sparksfamilyvalues#95319 commented
As the permanent is not entering the battlefield, you won't get the enter the battlefield trigger.