It's all great from Smarthuiyuan's blog

Require Dennis Eckersley as your Evolution Player and  also do his Program to get him. At Bronze 10, you will get an Evolution Option Pack that provides you the option between OF CarGo, 3B/LF Eddie Mathews, CP Dennis Eckersley and C Pudge Rodriguez. In the prior manual I advocated Eddie and CarGo too, but with Topps Now players becoming better, I think Eck is the obvious choice here. Your bullpen is the weakest part of your group, and MLB the show stubs 21 Eck is fine, not great, but will do. Together with the Run It Back Map handing out decent Relievers, I don't know whether I'd do the Evo Programs at all. Eck just doesn't make the cut on this team.

Buy some Relief Pitchers off the Market. With the Stubs you have gotten from the Maps, go treat yourself to some relievers. If you'd like a different lefty, 82 LHP Will Smith is a decent choice for super cheap.

I left these recos before there were Topps packs available in the Tatis Program, but I believe that they're still valuable in fielding a good group for the Conquest missions. An /* signifies this player makes the final team.This map is repeatable, which can be fine, which means you may get rewards again and again. Your Pen probably needs the most work, therefore Davis or Smith is most likely the move, if you get that choice.

Also added updated Topps Now pack choices, as there are some solid ones out of the new packs.

I'd definitely recommend Topps Now Mike Yastrzemski. He has great stats and his swing is one of the best.I also love Yaz. But I believe he had been in a pack with some other guys I loved, too, so that I needed to make some tough decisions to buy MLB The Show 21 Stubs fill a complete squad.