You dont end up losing one of the creatures for good, and you also become the monarch, giving you some extra card draw
You can transform the Incubator token you just created or one you already controlled
It may not be as efficient as Mutavault in this department, but it gets the job done
Of course, you could argue that Thran Temporal Gateway is a better Quicksilver Amulet, since most of the big creatures you want to cheat into play (like Eldrazi, for example) are legendary anyway, so they are technically historic, and Thran Temporal Gateway can cheat artifacts, Sagas, and other types of legends into play as well
Sorting your collection doesnt have to be one big task that has to be completed in a single day
Many cards have powerful Void abilities, which makes blocking quite hard in this format