Undercover Operative Malfunction
On PC, it was night and my Avabruck Caretaker was in Hollowhenge Huntmaster form. I did not think that my opponent could copy it using Undercover Operative given the hexproof but he was.
On top of that, he cast a second spell so it when back to daylight. My creature went back to Avabruck Caretaker form but my opponent remained in Hollowhenge Huntmaster form, how's that even right much less fair?!
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[Deleted User] commented
Clone-like copy effects do not target, they are replacement effects, that let the controller simply choose what to copy when the creature would enter the battelfield. So yes, this gets around hexproof, shroud, ward, and even protection.
Second, only transforming DFCs can transform. Undercover Operative is not one of those. So it can't transform, and keeps its copied characteristics from the Hollowhenge Huntmaster. Even if it could transform (like if your oponent used a Mirrorhall Mimic instead), the copy effect overwrites the printed characteristics, so it would still remain a Hollowhenge Huntmaster. It even transforms into it, if that is somehow relevant.