Preface: Anything I don't specifically call out looks fine to me. Oh, and I'm not that great at balance, but I'll try.
>Dragonhunter Bow
Copy Hedron Blade
>Whenever equipped creature blocks or becomes blocked by one or more Dragons, it gains deathtouch until end of turn.
Oh, and the Equip costs goes on the bottom.
Wait, WHAT?! You put the equip costs for all of them on the top?! Seriously, man? C'mon, you can do better than that.
>Infantryman's Spear
>[...] +1/+1 and has first strike.
>Phalanx Shielf
I can't even tell what this is supposed to do. Here's my best guess
>[...] it gets +1/+1 until end of turn for each creature it's blocking.
>Sandshield Cloak
Even to spells you control?
>Sandswimmer Harness
Man, this tribal focus is not doing you any favors.
>Camp Follower
No idea what to think of this one. Why is it a White Rogue?
>Brand of Cowardice
This isn't Red.
>Desert Stormcaller
This looks interesting.
>Furious Resistance
You should probably make reprints somehow so people don't start arguing about them or something.
>Inner Bravery
I have no idea whether this actually works or not.
>Rebel Sandswimmer
Self-bounce isn't very Red.
>Scarred Deserter
Wait, hold on. You have all these cards that talk about Cowards, but this isn't one? "Oh no, the fuzz! Better hide!" Total coward. Especially in Red. Red are like Krogans, they have twice as much balls as everyone else.
>Siege Ox
This is kinda interesting. Nice job. Though I'm not sure on the mana cost.
>Sow Dissent
Not sure how I feel about these counters. Is this a recurring thing? Regardless, it feels awkward on a common.
>Starving Lion
What the fuck? Did I miss something? Why is this a 3/3 with an upside for 2 in Red of all colors?
>Rebel Yell
Isn't this a Civil War Confederacy thing? Also, kinda weird that Blue cares about Rebels.
It's like Griselbrand.
Both of these scream "Break me, baby! Oh yeah, just like that! We'll do great things together!"