If someone is very desparate for the Cup, they'll have to work hard. But the best you can do is build a 22-man 5* squad in first season. Farm tokens the previous season. In the 3rd season they'll be 3* then you can go for the Cup. The contracts will end, and you'll have around 100T. So build your squad on season 4. And repeat the process. Haven't personally tried though, but seems effective on paper.