The Trade Deadline is widely considered an opportunity for contending clubs to bolster their squads as they eye a postseason run.

But on the flipside of every big move a contending club makes, there is a selling team adding to its prospect pool and preparing for the future. In the five days prior to this year’s Deadline, 90 prospects headed to new organizations, and 56 of them immediately vaulted onto their new teams' Top 30 Prospects lists.

The club adding the most players to its system was the Marlins, who brought in 14 new prospects, fueled by the deal that sent Tanner Scott to San Diego. Nine members of that group joined Miami’s Top 30 list, headlined by MLB’s No. 44 prospect, Robby Snelling.

The team trading the most prospects away was the Red Sox. Boston moved 10 players, including four in a deal with the Angels for Luis García.

On the latest MLB Pipeline Podcast, prospect gurus Jim Callis and Jonathan Mayo dug into the five teams adding the most prospect talent at the Trade Deadline.

Marlins: 14 prospects (9 on Top 30)
Callis: “I don't think they've built like a juggernaut farm system. It kind of reminds me of a year ago, when the White Sox came into 2023 with a farm system ranked near the bottom and they made a bunch of trades at the Deadline.

“I've had 12 players pushed off the Marlins list this year by trades. ... They have had three different guys on the current list take over as the top position prospect within less than a week. You had Deyvison De Los Santos take over the top position prospect spot after he came over in the A.J. Puk trade, then he was supplanted by Agustin Ramirez, who came over in the Jazz Chisholm Jr. trade. Then they got Connor Norby in the Trevor Rogers trade.

“Robby Snelling, who's currently on the Top 100 Prospects list, is the highest-ranked prospect that any team acquired. Maybe the most intriguing guy is Jun-Seok Shim, who came over from the Pirates. He was the second-highest-ranked pitcher we had on the international prospects list for 2023.”

Rays: 13 prospects (9 on Top 30)
Mayo: “The Rays really loaded up on pitching. Seven guys were arms out of all the trades that they made. I feel like Dylan Lesko was like a Rays' kind of Draft pick, had he been healthy. They're good at developing young pitching so maybe they can get him right.

“Brody Hopkins from the Mariners took a big jump up. Aidan Smith, the outfielder, I think is really interesting. It was very interesting to see how they went about acquiring the talent they got. Again, no like high-high-end guys, but a lot of guys at upper levels and trading from places where they felt they had an in-house replacement.”

Blue Jays: 12 prospects (9 on Top 30)
Callis: “I thought it was more quantity than quality in terms of high-end guys. I thought they got a really nice haul from the Astros for Yusei Kikuchi, including Jake Bloss, who would have been No. 2 on the Astros list. He was supposed to start last night for the Astros, and he got traded.

“So I was like, ‘Wow, that's a pretty good return.’ But in addition to him, they also got Joey Loperfido, who just graduated from prospect status off of our Astros list, but he was also in the big leagues, and you have essentially six years in control of him, and he could play a few positions.

“And they throw in Will Wagner, who is kind of like a gritty glue guy who doesn't have a lot of tools, but just seems to keep on hitting. I thought that was a really good return.”

Angels: 6 prospects (4 on Top 30)
Mayo: “Their system was pretty thin. So quantity is good, and they got some quality. The Phillies obviously sold high on George Klassen and Samuel Aldegheri, but both of those pitchers who were in the Carlos Estévez trade were going to make huge jumps up the Phillies list.

“They got Matthew Lugo in that Luis García trade, and he's at the upper levels. He can move around a little bit. He plays a decent outfield now. He is not quite top 10 in the current list, but for a system that needed talent, it was an interesting influx of guys who all seem to be headed in the right direction."

Nationals: 5 prospects (4 on Top 30)
Callis: “They made two moves that I think were useful. The night before the Draft they traded Hunter Harvey, and they got Cayden Wallace from the Royals. I've always liked Cayden Wallace, he was a second-round pick a couple years ago. They also got a supplemental first-round pick in that deal that they turned into California catcher Caleb Lomavita.

“They traded Lane Thomas the day before the Deadline and got three players from the Guardians, most notably another second-round pick from last year's Draft, Alex Clemmey, a left-hander who needs polish, but has one of the highest ceilings among lefties in the Minors. Throws hard, wipeout breaking ball, really interesting guy, super young."