MTG Salvation

I haven't spent any time on my c/ube since M:O and it's clearly out of date. This was a straight rip-off of Majikian's cube, but he hasn't updated his for awhile either. I'd like to bring it up to speed with recent sets.

http://www.cubetutor.com/viewcube/33352

Some things I am looking at as options include:
Rolling Thunder
Heir of Falkenrath
Duskwatch Recruiter
Renegade Freighter
Untethered Express
Ridgescale Tusker

But generally I need a lot of help from the experts!

Thanks in advance for any assistance.

To add on to Hac's suggestions, I play or have come close to playing:

To add on to everyones suggestions, here is my unique list of suggested cards:

"Rolling Thunder
Heir of Falkenrath
Duskwatch Recruiter
Renegade Freighter
Untethered Express
Ridgescale Tusker"

All good cards.

From leadfeather/Froz, I'll rate his batch in groups

Yes:

• orzhov advokist
  
• gryff's boon
  
• mirror match
  
• Gifted Aetherborn
  
• Corpse Augur
  
• Terrain Elemental

Reasonable:

• trueheart duelist
  
• oketra's attendant
  
• cast out
  
• Cyclone Sire (?)
  
• Carrier Thrall
  
• Kessig Forgemaster
  
• Embodiment of Fury
  
• Pyretic Hunter
  
• Cytoplast Root-kin
  
• Seed Guardian
  
• Soul Ransom
  
• Catacomb Sifter
  
• Mystic Genesis
  
• Stormchaser Mage

Borderline:

• dawnfeather eagle
  
• seraph of suns
  
• blessed alliance
  
• borrowed grace
  
• tenacity
  
• ingenious skaab
  
• illusory ambusher
  
• Cartouche of Knowledge
  
• Slip through space
  
• Lay Bare the Heart
  
• Sinuous Vermin
  
• Liliana's Elite
  
• Vengeful Rebel
  
• Accursed Witch
  
• Supernatural Stamina
  
• Transgress the Mind
  
• Baleful Ammit
  
• Reckless Racer
  
• Skin Invasion
  
• Emberhorn Minotaur
  
• Embodiment of Insight
  
• Pulse of Murasa
  
• Tajuru Pathwarden
  
• Ancient Excavation
  
• Khenra Charioteer
  
• Aven Wind Guide
  
• Mindless Automaton

I would not:

• Trusty companion
  
• Wall of resurgence
  
• inspiring captain
  
• Aberrant Researcher
  
• Shimmerscale Drake
  
• Windrider Patrol
  
• Grip of the Roil
  
• Open Into Wonder
  
• Festering Mummy
  
• Conduit of Storms
  
• Shefet Monitor
  
• Vessel of Nascency (I would just run) grapple with the past
  
• Kozilek's Channeler
  
• Ninth Bridge Patrol

I'm also going to be at a disagreement with Haccy about removing a number of those aggro 1s and 2s, like plated geopede

Hence "a number"
Geopede as a keep and nactl as a cut are things I advocate for