If you're a Major League Baseball team in need of good pitching, the Seattle Mariners are the team that you should have your eyes on. The Mariners have boasted one of the best starting rotations in baseball for years at this point. It seems like each time the trade deadline rolls around, someone wants to talk about one of the Mariners' hurlers. But no one has had success plucking one away. Right now, the Mariners' rotation features Logan Gilbert, Bryan Woo, George Kirby, Luis Castillo, Emerson Hancock and the recently-returned Bryce Miller. That's a great rotation on paper, but are they going to roll with a six-man rotation forever? Seattle has so much pitching — which is obviously a good problem to have — but the offense isn't great. While sharing notes around the league, The Athletic's Ken Rosenthal reported that the Mariners could "entertain" trading a starter ahead of the Aug. 3 trade deadline if they are healthy around that time.…