Mr. Bluth, Justice is blind.

THIS is the ABSOLUTE BEST deck for GAUNTLET (criminals hate it)!!!
first of all, this is the (mono) justice system we're talkin' about... so if the bad guys (AI) are guilty (always) this deck will definitely send them to jail (die).
second, it has a crazy LOW retainer fee (mana curve) so you know you're getting a high quality lawyer (wait..).
third, it's made almost entirely of hulking dudes (units) so you'll always have a presence in the courtroom (battlefield).
fourth, the few bits of paperwork (spells) it does have are cheap and potent, you'll always catch the prosecutors (also AI) off guard.

alright, so now that i've clearly and obviously established i'm a man of the law, i'll drop the rhetoric for your benefit (but i love parenthesis so i'm gonna keep doing that (sorry)).

core of the deck (don't change this) -- Finest Hour, Ghostblade Outcast, Kira, the Prodigy, Steyer's Eyes, Helena, Skyguide, Tarra, Ever Loyal, Unseen Commando, Valkyrie Enforcer, and 4x market access (Warren Delivery or Justice Etchings).

gameplay:
- turn 2 kira into turn 3 contracted helena is game over
- t2 kira into t3 steyer's eyes/crownwatch tactic is game over
- t1 ghostblade into t3 tarra is game over; after linking with tarra attack with ghostblade, even if he dies. you get to exalt onto tarra BEFORE her double power/toughness triggers so she becomes an 8/8, warcry 6, lifesteal...
- use finest hour (or other pumps) to give tarra additional PERMANENT power/toughness. right before the unit linked to tarra dies, play finest hour on tarra. when the linked unit dies, the tara trigger sees her as a 6/6 so she doubles to 12/12. the +3/+3 from finest hour falls off at end of turn, leaving tarra as a 9/9 (instead of the normal 6/6)
- use pump spells on a dying ghostblade to make the pump spell permanent; he exalts with the exact stats/keywords he dies with

good/budget unit alternatives -- Shen-Ra, Unbreakable, Hojan, Crownbreaker, Crownwatch Paladin, Ursa Squadron, Charming Steelguard, Scalesworn Patrol, Rallying Trumpeteer, Winchest Merchant.

alternate spells -- Bubble Shield, Silverblade Intrusion, No One Left Behind, Vanquish (becomes a bit superfluous if playing West, On the Trail), Smite

market options -- Working Together, Edict of Kodosh, Smite, Copperhall Bracers, Monarch Cloak, Pristine Light, Copperhall Chancellor, Cleansing Rain, Harsh Rule, General Fiera, Guardian Angel, Svetya, Lightbringer

the market also depends on what type of market access you're playing. i recently switched to Warren Delivery (fast market access is crazy) so i've been experimenting with cheaper fast spells like Bubble Shield and Silverblade Intrusion to be more reactive.

EDIT: the newest card added today, Sparring Session, is IIIINNNNNNSAAAAAAAAANE!!!!!!! it's like playing 2 Hero of the People on a 1 mana spell... this entire deck is keyword soup so being able to fully share all keywords between 2 units is bonkers (it's particularly good with ghostblade). additional sparring sessions also completely snowball the keywords -- if the game lasts long enough (which it rarely does) you can end up with multiple units that have every keyword in your deck. AND it makes temporary keywords (lifesteal from crownwatch tactic, flying/endurance from helena) PERMANENT on another target. AND AND AND it can almost completely nullify silence. if they don't silence your entire board, just throw all the keywords from one of your previous sparring session targets back onto the silenced unit... it's crazy, use it now.