I've made a Paladin deck that can go toe to toe with the standard zoo/miracle/whatever decks at the early single-digit ranks in ranked mode. I dunno if the deck has any kind of "gimmick" or "theme" to it. It's just.. strong cards that help keep control of the board and such and also can deal with some of the heavy hitters they bring out during the end of matches.
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I don't know if the others will agree with me, but here's what I'd change.
Take out the following cards:
Hand of Protection - it's shit and a tempo loss. Not only that, it's often a dead card imo - as far as I'm concerned it's only useful if you're about to combo a huge Blood Knight.
Sunfury Protector - you already have 2 Argus. I'd go all in with either, but not 2 Argus + 1 Sunfury. You don't have a lot of high cost minions, so Argus is better value late-game.
I would potentially remove:
Guardian of Kings - you already have Lay on Hands, and with 2 Truesilver Champions you have 4x 2 heals for much better value.
I'm also kind of usure about Sword of Justice. It's nice, but you need much more of a token deck with a lot of creatures for it to be useful, imo. Also since a *ton* of people run Oozes (at the minimum 1) now because of Control Warrior (especially in ranks 10 and down) it'll get oozed a ton, unless they're expecting Tirion Fordring (which you don't have anyway - it'd be a great card for this deck).
Scarlet Crusader is cute for the shield, but it's use is typically limited to Zoo decks where it'll shine the most (or in conjunction with a Blood Knight, which would work very well in this deck).
Add in
1x Consecrate (for 2)
1x Truesilver Champion (insane OP weapon)
As for other potential adds:
1 more Knife Juggler (it's basically a minion with taunt, btw)
1 more Argent Crusader (awesome value)
1 or 2 Equality (very powerful 100% board clear, will help against big threats and Zoo when they pump up above 2 HP when comboed with Consecration)