Jin

Jin 100 cards, 0 sideboard 1 Jin-Gitaxias, Core Augur 44 Island 44 lands 1 Djinn of Wishes 1 Kederekt Leviathan 1 Sphinx of Jwar Isle 1 Clone 1 Surrakar Spellblade 1 Spire Monitor 1 Roil Elemental 1 Jin-Gitaxias, Core Augur 1 Bubbling Beebles 1 Air Elemental 1 Wall of Frost 1 Lorthos, the Tidemaker 1 Mnemonic Wall 1 Harbor Serpent 1 Water Servant 1 Phyrexian Hulk 1 Phyrexian Colossus 1 Jace's Phantasm 1 Headless Skaab 1 Hand of Emrakul 1 Scrapdiver Serpent 1 Air Elemental 1 Conundrum Sphinx 1 Sphinx of Lost Truths 1 Stormtide Leviathan 1 Horned Turtle 1 Goliath Sphinx 1 Serpent of the Endless Sea 1 Halimar Wavewatch 1 Deep Spawn 1 Inkwell Leviathan 1 Ulamog's Crusher 32 creatures 1 Ior Ruin Expedition 1 Volition Reins 1 Talrand's Invocation 1 Jace Beleren 1 Crown of Ascension 1 Quest for Ula's Temple 1 Stasis Cell 1 Diminish 1 Sleep 1 Cancel 1 Essence Scatter 1 Whispersilk Cloak 1 The Rack 1 Elixir of Immortality 1 Skittering Invasion 1 Darksteel Axe 1 Demon's Horn 1 Redirect 1 Flight 1 Mind Control 1 Jace's Erasure 1 Echo Circlet 1 Ice Cage 23 other spells Sideboard Notes:

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Who's the Commander?

I'd guess Jin gitaxis core auger

On a quick glance, I think you would need stuff like caged sun, reliquary tower, spellbook, laboratory maniac, extra planar lens, etc. you need things to keep your cards, and you need to ramp so you can play fatties with that big of a general.

First off, I must say, I love Jin Gitaxias.

Unfortunately, everyone else despises him. He's going to be a huge target, so once you play him, you need to make sure he stays in play. Cards like  Swiftfoot Boots and Lightning Greaves will help keep him safe once he's in play.

Getting him in play is another issue. You'll need a pretty good amount of ramp. Coalition Relic, Darksteel Ingot, Sol Ring, Gilded Lotus, Dreamstone Hedron, and Journeyor's Kite can all help ramp up to Jin. Also, Dreamscape Artist is a decent mana ramp creature, and I strongly suggest Terrain Generator to help put those extra lands into play.

Now, you'll need to protect yourself while ramping. I see you have some counter spells, which is good, but I'd add a few more. Hinder and Spell Crumple are great for ticking away generals, so you don't have to worry about them! Spin Into Myth serves a similar purpose. Forbid deserves a mention as well.

Now, if something big does hit the field, you'll need to take care of it. Capsize is a great way to help clear the field, and Brittle Effigy, Oblivion Stone, and Nevinyrral's Disk are all good ways to keep the board clear. There's also slower options like Argentum Armor and Spine of Ish Sah.

And now, we have creatures! I'd try and take advantage of the big hand size you'll have, and Aeon Chronicler and Psychosis Crawler fit that role perfectly, with the crawler dishing out some serious life loss along the way. Draining Whelk is a cool card, and serves as protection as well. Steel Hellkite can serve as removal, and Arcanis the Omnipotent can give you great card advantage if Jin isn't in play. On the cheaper (mana cost) side, there's always Enclave Cryptologist to help get things rolling, and everyone loves Solemn Simulacrum. I've personally found Sower of Temptation to be a nasty card as well.

And it would probably do well to throw in some cards to make your hand an even bigger threat. Teferi, Mage of Zhalfir can be fun for cbat tricks, and slows down your opponent, and Venser's Journal can net you some great life gain. Mind Over Matter can help pitch lands if you start to draw more than you need, and can serve as combat lockdown or untapping mana sources if you need it.

Hopefully I didn't say any cards you already have in here (I'll go through and try to make sure), and hopefully you can pull a few cards from these suggestions to help you!

I'm that mana ramp, don't forget mana vault, and if your using artifact ramp, use voltac key.  A friend that little combo, and can get sheroom the hedgemon out on turn 3...

That deck annoys me...

Now Keyeto is right that everyone will hate you for playing Jin.  He is a commander screws everyone over.  So have fun being hated!
But I like Jin so I wish you the best of luck.