The first major trade of the MLB offseason is official: The Toronto Blue Jays are sending All-Star outfielder Teoscar Hernandez to the Seattle Mariners, according to Jeff Passan. The return has not yet been specified, but the Mariners will get another quality outfielder to pair with American League Rookie of the Year Julio Rodriguez.Jeff Passan@JeffPassanBREAKING: All-Star outfielder Teoscar Hernández has been traded to the Seattle Mariners from the Toronto Blue Jays, sources familiar with the deal tell ESPN.58461238BREAKING: All-Star outfielder Teoscar Hernández has been traded to the Seattle Mariners from the Toronto Blue Jays, sources familiar with the deal tell ESPN.This is a big move that further vaults the Mariners into the playoff conversation. They made it as a Wild Card last season and ousted the Blue Jays before being swept by the Houston Astros in the team's first playoff appearance since 2001.Clearly, they're excited about their future and wanted to add a young, talented outfielder to their roster.MLB fans are shocked that the Blue Jays would send their All-Star away and that the Mariners were able to add such a talented player.Others wondered about the return and if the trade was worth it for Toronto.Oxford Dictionary Expert@Jsixx__@JeffPassan GOOD MORNING MARINERS FANS114@JeffPassan GOOD MORNING MARINERS FANSSports of Seattle@SportsofSeattle@JeffPassan Had to quadruple check this wasn't a parody account33@JeffPassan Had to quadruple check this wasn't a parody accountMario Gomez🚂😁🌧️@marioagomez_1@JeffPassan stove is hot27@JeffPassan stove is hotMLB Deadline News@MLBDeadlineNews@JeffPassan Wonder if Winker is heading to Toronto15@JeffPassan Wonder if Winker is heading to TorontoFaZe Sabastian@cbass@JeffPassan Not feeling optimistic about this return. Sad to see Teo go!711@JeffPassan Not feeling optimistic about this return. Sad to see Teo go!KevinGohD@KevinGohD@JeffPassan WHAT62811@JeffPassan WHATZach (parody of a parody)@zachzeaman@JeffPassan WHATTTT SEATTLE KEEPS GETTING STRONGER1@JeffPassan WHATTTT SEATTLE KEEPS GETTING STRONGERC-Low@elrealcarl@JeffPassan HO LY SHIT. What a time to be a mariners fan, big favorites to win AL West , what an amazing pick up2@JeffPassan HO LY SHIT. What a time to be a mariners fan, big favorites to win AL West , what an amazing pick upsign rodon 🫵@LindorRBW@JeffPassan LMAOOOOOO FOR CHRIS FLEXEN 45@JeffPassan LMAOOOOOO FOR CHRIS FLEXEN 💔💔Peter Appel@peterappel23@JeffPassan For WHO JEFF751@JeffPassan For WHO JEFFThe player(s) Toronto is getting back may be good and at the MLB level. They've had one of the best young cores in baseball for a couple of years, so they'd have to be strongly enticed to part with one member of it.Potential Seattle Mariners lineup with Teoscar HernandezThe addition of Hernandez gives the Mariners a strong hitter with capable outfield defense. He can easily hit towards the top of the lineup for Seattle and produce really well.Their lineup could look like this:Julio Rodriguez CFTy France 1BTeoscar Hernandez LFMitch Haniger RFCal Raleigh CEugenio Suarez 3BCarlos Santana DHJ.P. Crawford SSAdam Frazier 2BFrazier, Santana and Haniger are all pending free agents right now, so those are subject to change.Division Series - Houston Astros v Seattle Mariners - Game ThreeIf the Mariners don't bring them back, they could go after someone like Michael Brantley, Jean Segura or Jose Abreu to pair with Hernandez to make a really strong offseason.Regardless, the lineup Seattle can now field with the former Blue Jay in town is incredibly strong. They know they are in a contending window and are going all-in to capitalize on the team's success and young roster.This trade is just the first step.