Sometimes called "Magno the Miracle Man", sometimes called "Magno the Magnetic Man", the character's first Golden Age appearance was in Smash Comics #13 (August 1940):


And as was the case with such other former Quality Comics characters as Miss America, Invisible Hood, Neon the Unknown, and the Red Torpedo, Magno's first appearance in a new story from DC = All-Star Squadron #31-32 (cover-dated March 1984 and April 1984):

but it appears that didn't end quite so well for poor Tom Dalton.