Make it obvious why a player is allowed to cast spells from the top of their library
My opponent had Falco Spara, Pactweaver which allowed him to play cards from the top of his library. He also had a lot of other creatures, and I wasn't familiar with most of his creatures including Falco. So when he started casting spells from the top of his library, I was very confused and tried to figure out which card allowed him to do it. The fact that Falco has other abilities as well didn't make it easier.
It would have been a lot easier if there were some way to make it immediately obvious why a player can cast spells from the top of their library. For example, when I get negative life but don't lose because of Platinum Angel, Platinum Angel blinks in red making it immediately obvious why I didn't lose. An idea for how to implement my suggestion would be to make Falco blink in a certain color whenever its controller casts a spell from the top of their library (it could blink in green for example, indicating that it allows something to happen, in contrast to red which indicates that it prevents something from happening).