Jay-Z isn’t just one of rap’s greatest hit-makers; he’s one of hip-hop’s fiercest competitors too. Jigga’s verbal joust with Nas went down in the history books, but God’s Son wasn’t his only opponent. Many fans would be surprised to learn that back in 1998, Jay and Ma$e were engaged in a subliminal battle, where each hurled disses, even if they never said each other’s name. So what started the feud? “A girl named Arion,” Ma$e said when he appeared on “RapFix Live” on Wednesday.