Signature Series Edwin Encarnacion is in the newest Showdown that has been added to MLB The Show 20. It is a much shorter Showdown, so you should have less issues running through it to get what looks like at worst a very good bench bat.
Starter 2 Showdown
The Showdown is free to enter, so that falls in line with the original Starter Showdown that tied into George Brett.
From there, you should be able to run through the one mini-boss and the final boss to get Edwin Encarnacion:
There is also a Stubs Sale going on right now to coincide with getting people reacquainted with Opening Day being upon us.
The Stubs Sale will run until July 28 for those of you who are interested.