To be honest, probably nobody since its very rare...but my 2 options are:
Marlins
Reds
They each have some good young position players and also good young starting pitching. I don't see either making a run past MAYBE grabbing a wild card berth, but those are my best potential answers to your question (if a few key guys can make the jump to the next level).
FWIW...I used the idea that theyre underrated and bet on each game played by those two teams (RL) and looks like heading to 3-0 start to season on them if Marlins hold on today. So what are your thoughts on your own question, Vinny?