Metal Allegiance, the metal supergroup featuring core members David Ellefson (Megadeth), Alex Skolnick (Testament) and Mike Portnoy (The Winery Dogs, ex-Dream Theater), along with multiple special guests, have premiered a new video for their song “Gift Of Pain” featuring Randy Blythe (Lamb Of God) and Gary Holt (Slayer, Exodus). This song is from the band’s…