The rebacked and old proxy cards can easily be identified by their weight and thickness while the blue core proxies are of very high quality and are a bit hard to identify and need to be tested by looking at the details of their printing pattern and direct exposure to light for penetrability
You can't physically mess with another player's hat (or other possessions or self or anything)
So when I look at Prosper, Tome-Bound, what I see is a perfectly functional commander in my favorite color combination, with my favorite D&D class attached to it, and mechanics that actually feel very in-line with warlocks
You could easily play this as the only Un- card in your entire deck
If the chosen permanent is a token, Copy Enchantment copies the original characteristics of that token as stated by the effect that created the token
1 Rograkh, Son of Rohgahh