Schultz was 2-2 with a 5.64 ERA in 22 appearances with one start for the Rays last year.
In six minor league seasons, Schultz is 22-17 with a 3.57 ERA. The 27-year-old pitcher was selected by the Rays in the 14th round of the 2013 amateur draft out of High Point in North Carolina.
Sampen was 0-2 with a 5.04 ERA in 13 games, including 11 starts, for rookie-level Ogden last year. The 22-year-old was selected by the Dodgers in the 20th round of last year's draft.