It's perpetual Jays farmhand and alleged PES user Howie Clark, who was signed as a minor league free agent by the Jays according to Baseball America.
(And now, we pause so that future anonymous commenters can begin losing their shit over the fact that the Jays signed Howie Clark and not Manny Ramirez. Annnnnnnnd...there. That should do it.)
Clark may well have another opportunity to discern the difference between an Alex Rodriguez squeal and Johnny Mac calling him off an infield fly. Then again, if Howie sees action at the Major League level at any point this season, the Jays are going to have bigger problems than A-Rod's poor sportsmanship.
Welcome back, Howie! We barely knew you were gone!