Finest Hour
x4
1
Ghostblade Outcast
x2
1
Seek Power
x4
1
Silverblade Intrusion
x1
2
Crownwatch Paladin
x4
2
Fearless Crescendo
x2
2
Kira, the Prodigy
x1
2
Lay Siege
x1
2
Outcast Elite
x4
2
Tranquil Scholar
x3
2
Willbreaker
x2
3
Gilded Glaive
x2
3
Hero of the People
x4
3
Master's Blade
x3
3
Silverwing Familiar
x3
3
Slay
x3
3
Surgeon's Saw
x1
3
Unseen Commando
x2
4
Corrupted Umbren
x2
4
Lethrai Falchion
x1
6
Pale Rider's Timepiece
x1
Justice Sigil
x7
Shadow Sigil
x7
Argenport Insignia
x4
Common Cause
x2
Emblem of Kodosh
x1
Seat of Vengeance
x4
View Deck on Shiftstoned
You mentioned that you were having problems with power flood/screw, so I'll address that first. These types of Argenport decks want to be aggressive, so if we run 4 Seek Power we're probably going to end up flooding too frequently. I would cut Seek Power down to 0-2 copies. Since we're an aggressive deck, we want to be lower on the curve, so we can't afford to run 6-drops like Pale Rider's Timepiece and Surgeon's Saw. I'd also cut Silverblade Intrusion because it's really hard to hit 5J in this deck. Going lower on the curve also mitigates power screw, since we'll be able to play most of our cards even if we only have 2 or 3 power. I found Common Cause to be unreliable, as we aren't full Unseen tribal, so I'd run a couple more Justice sigils instead (going a little higher on Justice than Shadow helps with hitting Ghostblade on 1 and Commando on 3). Finally, additional emblems instead of sigils will help alleviate flooding by turning into units as needed. Emblem of Makkar seems nice to give Hero Deadly, but Kodosh isn't bad either.
Ghostblade Outcast is too good to not be 4x. She's an Unseen for Outcast Elite, gives Hero Exalted, has 2 battle skills, and is great with warcries. I would also run 4x Reborn Master. An Unseen that can buff most of the team and also gives Hero Endurance is just great. Unseen Commando also wants to be a 4x, but I can understand if you don't want to spend the stone. Auric Sentry is a possibility with his 2 battle skills and warcries, but you might not want too many 3-drops. Oddly enough, I don't think this is a Kira deck, since she has no battle skills and the only temporary buff in the deck is Finest Hour (and Wind Conjuring in the market). If you have any copies of Unseen Longbow you could use those instead of the Gilded Glaives. The Quickdraw can make your smaller units hard to block or add a second battle skill.