The 18-year-old has agreed to sign for the full value of the No. 83 pick in the Draft, which is $661,800.
Wells throws a fastball in the low 90s that saw a large increase in velocity over the past year. He's also equipped with a solid breaking ball.
"He's already shown a plus curveball," Blue Jays director of amateur scouting Brian Parker said. "[He's] a young, projectable lefty [who's] flashing an above-average breaking ball."
Wells, who had previously committed to the College of Charleston, is coming off a season in which he posted a 1.06 ERA in 53 innings. He struck out 102 over that span and had six complete games and a pair of no-hitters.
During his final outing of the season, he struck out the final 14 batters he faced in a 4-0 victory. In 2013, he went 7-2 with a 0.45 ERA, four complete games and 72 strikeouts in 61 2/3 innings.
Jamie Ross is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.