This has been my most successful deck in the KLD season, with around a 75% win rate at rank 40. The addition of Scrapheap Scrounger and various vehicles has dramatically improved the matchup against Languish decks, and Copter/Key to the City solve one of the main problems of non-red aggro (lack of reach). I honestly prefer this list to vehicles, both RW and Mardu, but YMMV.

Overall, the deck has an ok matchup against most other aggro decks (Always Watching and Key to the City are aces, since the former guarantees you'll outmatch the opponent on board and the latter means you can essentially stop drawing lands, letting you inevitably draw more relevant creatures than the opponent). The matchup against ramp is excellent (you usually just kill them before they do anything), and most hard control lists are good as well (especially if they spend mana on do-nothing cards like Tutelage or Fevered Visions).

Midrange matchups are very difficult, however. Abzan and Bant in particular pose an enormous challenge, since Sylvan Advocate, Reflector Mage, Kalitas, Woodland Wanderer and Avacyn are all very difficult to deal with, and they often run enough early removal to keep from being overrun.

The most likely candidate for replacement is Renegade Freighter, since there are a decent number of games where you get a glut of three drops in hand and can't play threats out fast enough. Sadly, nothing in Aether Revolt is particularly interesting for this deck, so it's unlikely to improve much in the next season.