Giggs at Man U and Cristiano at Sporting, and proper Ronaldo at PSV come to mind.
But those three were special players, and you’re right, it doesn’t happen often.
Ricardo Pepi seems pretty special, 18 years old, just finished scoring 13 goals for Dallas this season and starting striker for the USA in his second season. Somehow Augsburg outbid a slew of teams to sign him for $20 million+. It'll be interesting to see how the young lad gets on in Germany.