Garen's ult reveals the true shaco
idk if this works on other champions with clones, Leblanc and Wukong, but I was just Garen on an ARAM. enemy Shaco becomes the villain and when he ults, the marker is still hovering the real shaco like a red buff would.
The clone should be an actual clone at the time of casting, i.e., if shaco was the villain before he ulted, the real shaco and his clone should both have the villain marker.
I'd argue that this should be the case for buffs too, e.g. give Leblanc's mirror image a blue buff if she had a blue buff when her passive pops...but let's not get ahead of ourselves.
tl;dr put villain marker on shaco AND his clone. the same goes for wukong, leblanc, and any other duplicating champs i may have forgotten.