Tezzeret looks quite good here, but I don't think you need a full four of it with all the other stuff like PO and Jewel (you just naturally draw a ton of cards with this deck to see things)
If you use their relative strength to compare whether you should trade, then the trade looks abysmal for Belle
Here are some examples of proxies on their front face, with alternate art, frame, or rules text: Usage Counterfeits are cards that simulate legal and real cards, so people usually play counterfeit cards at the FNM level or at sanctioned tournaments
While a little confusing, it creates a massive creature in the end
In a game where discarding increases the probability of getting the card that a player really needs to up the ante, and where drawing increases the chances of achieving that, Professor Juniper and Sycamore are nothing short of angels