Gladiatorw07f

Probably chatted to death, but: Asside from attacking, what is tapping gilderbarn down?
I see ramp in birds and paragon, but you dont have enough blue mana that can be up turn 2: my sugestion is:
4X Flooded Grove traded for 2 forests and 2 islands. This gives you mana fixation if you get green flooded with your elves, and
4x Hinterland Harbor. you have shock lands, and Lanowar reborn is not a very high power land.
Swap the paragon for Brawns. They give trample in grave with no other conditions. There are also better ways to give out +1+1 counters.

Demonic tutor. 1 [b] same as your current tutor.

cant really suggest much else. I don't play legacy that much.

Demonic Tutor for Diabolic tutor. Demonic Tutor: 1 {B}: Tutor any card from deck to hand

Oh dear lord. So much AOE Draw, And AOE Discard, and AOE life Loss!

I am kind of horrified to see this deck actually try and roll!

I am saying jin either needs more direct abuse in the deck, or to build in a couple more win conditions other then lab maniac and MoM + TB.
You missed on Words of Wind ({1}: The next time you would draw a card bounce target permanent instead. ) This combos with All your draw amazingly.
Jin Is also very Mill oriented, with discarding the hands of hte opponents each turn. Jace (MS), Jace (MA), and classic jace also work for the deck.
Next up for the list of things to change is your lack of uyo. Your blue, what better way to control the game then to copy then counter each big win button your opponent uses. She also works with Jin, as she creates an influx of cards for you to fling around with cards like: Chamber of Manipulation, Compulsion, Diplomatic Escort, Grimoire of the Dead, Skullmead Cauldron (not highly recommended), Stronghold Biologist, Stronghold Machinist, Trade Routes, Trading Post, Waterfront Bouncer. Each of these cards are all monoblue, and play into JG's 2 effects. With no hands the foe is top decking, and whatever they play can be stopped, reversed, or turned against them.

Also Washout is a great way to deal with a few pesky commanders like sigarda and rhys

Hex Paracite! Much bettter version x+Phyrexian black: remove x counters from target permanent.

JG does discard combo draw. For that Dimir is SO MUCH BETTER! Then JG can not command. My point on better commanders still stands. Pluss what is the win condition here. I see lab maniac and ulamog....that is it.

Command Child of alara, and rock out all the cascade cards. Wanderer on his own is a different deck entirely. The big trick with cascade is to hit your win cards for free. Examples are: Crule Ultimatum, Violent Ultimatum, Other Cascade, Dreadboar, Terminate, est

Other ways to abbuse it is to have creatures that generate swarms or go super freinds cascade.

There are much better blue commanders for what you are trying for here. Much faster as well.

The core problem of this deck is that JG is your SOLE source of reliable draw (arcanis wont last long. He touches the borde and he is stolen, cloned, or dead. He is just to good with untap that blue has). JG is also a big KILL HIM light blazing over your head, Azami taps wizards to draw cards, and while she is a kill me button, JG also kills other players' hands.

I Disagree with Thrull Parasite. I see A lot of pesky +1/+1, charge, est counters floating around. THRULL PARASITE CAN HIT PLAINSWALKERS! Mono black has no way to deal with a plainswalker other then removing its counters, or destroy target permanent. Which there is a VERY limited number of, so having that utility to chow down on a plainswalker like venser is AMAZING!