It doesn't take a lot of imagination to figure out what might go in an Argentport midrange deck, but this one has done well on the ladder. Nothing in here should be a total surprise, but notes on a few cards:
Argenport Noble - I've noticed that a lot of Expedition games come down to racing because the removal is so bad, and this lets you 1) get Lifesteal on a good unit; and 2) knock a flyer out of the sky. Also a good answer to the Nest.
Sinister Research - I wanted more power, and invoking shadow sometimes gets you very nice cards. Very much replaceable.
Lunar Claw,
Scalesworn Patrol, and
Furious Magniventris - has there ever been a small set like this before where all three of the cards for one faction are just amazing? It's hard to imagine not playing all three of these cards in any Justice deck (and kind of hard to imagine not playing Justice in Expedition)
Raniya, Wings of the Cabal - this already was a solid card, but with the Magniventris running around in every deck, it's a great answer to that card.
Enjoy!