Absolutely. I'll start with the team that brought in Bronson Arroyo on a minor league deal. Maybe not the most recent, but certainly the most significant.
You never know at the start of the season who are going to be the best depth options. WHich is why every off-season, Epstein's very first move was to sign half a dozen our do pitchers to minor league deals. Most of these pitchers never saw MLB, but every now and then, he'd get a difference maker like Arroyo or someone who who be dealt for a significant difference maker, like Brandon Lyon (packaged for Schilling).
But, hey, why explore rarely successful depth tactics when you've already got a rotaruon depletef to the point of using Hector Velasquez and Brian Johnson in the rotation?