9th leagues

[Strazos]

You need to pull some mana acceleration from a booster.

BTW, I love my fancy green card.

[Shockeye]

I can see replacing blue in my deck with black, but I hate to give up flying stuff.

[Margalis]

If you are going to play blue, why aren't you playing Aven Windreader? That's basically your best blue card and it's not in your deck. IMO your blue is pretty weak overall.  I would probably play green/red, or else go 3 color.

Red has Volcanic Hammer and Orcish Artillery, which can win games almost by itself. The deck you made only has about 12 creatures, a bunch of which are not really threats. (Wood elves, etc) What is your plan to win? Get levitation and overwhelm with flyers?

[Xilren's Twin]

If you are going to play blue, why aren't you playing Aven Windreader? That's basically your best blue card and it's not in your deck. IMO your blue is pretty weak overall.  I would probably play green/red, or else go 3 color.

Red has Volcanic Hammer and Orcish Artillery, which can win games almost by itself. The deck you made only has about 12 creatures, a bunch of which are not really threats. (Wood elves, etc) What is your plan to win? Get levitation and overwhelm with flyers?

Agreed.  Red also has one of my favorites, Panic Attack.  Nothing like opening up a huge hole in you opponents defense to act as a finisher (plus it's really out of flavor for red and therefore unexpected).  Need more critters.

Xilren

[Raging Turtle]

Since you invited the mocking...

Here is my card pool:

Artifact:
1 Aladdin's Ring
1 Phyrexian Hulk

Land:
1 Urza's Mine

Black:
1 Bog Wraith
1 Coercion
1 Consume Spirit
1 Contaminated Bond
1 Dark Banishing
1 Enfeeblement
1 Fear
1 Giant Cockroach
1 Hollow Dogs
1 Looming Shade
1 Mind Rot
1 Ravenous Rats
1 Soul Feast

Blue:
1 Aven Windreader
1 Boomerang
1 Crafty Pathmage
1 Evacuation
1 Fishliver Oil
1 Flight
1 Horned Turtle
1 Levitation
1 Lumengrid Warden
1 Mana Leak
1 Remove Soul
1 Sage Aven
1 Sift
1 Thought Courier

Green:
1 Anaconda
1 Craw Wurm
1 Creeping Mold
1 Elvish Berserker
1 Giant Growth
1 Giant Spider
1 Llanowar Elves
1 Naturalize
1 Reclaim
1 Rootwalla
1 Stream of Life
1 Verduran Enchantress
1 Wood Elves
1 Zodiac Monkey

Red:
1 Balduvian Barbarians
1 Firebreathing
1 Flowstone Shambler
1 Goblin Piker
1 Hill Giant
1 Orcish Artillery
1 Panic Attack
1 Raging Goblin
1 Seething Song
1 Shatter
1 Volcanic Hammer
1 Whip Sergeant

White:
1 Circle of Protection: Red
1 Demystify
1 Foot Soldiers
1 Mending Hands
1 Pacifism
1 Pegasus Charger
1 Samite Healer
1 Sanctum Guardian
1 Serra's Blessing
1 Suntail Hawk
1 Veteran Cavalier
1 Warrior's Honor
1 Weathered Wayfarer
1 Wildfire

Here is my first deck:

Artifact:
1 Phyrexian Hulk

Land:
8 Forest
7 Island
1 Urza's Mine

Blue:
1 Boomerang
1 Evacuation
1 Flight
1 Horned Turtle
1 Levitation
1 Lumengrid Warden
1 Mana Leak
1 Remove Soul
1 Sage Aven
1 Sift
1 Thought Courier

Green:

1 Anaconda
1 Craw Wurm
1 Creeping Mold
1 Elvish Berserker
1 Giant Growth
1 Giant Spider
1 Llanowar Elves
1 Naturalize
1 Reclaim
1 Rootwalla
1 Stream of Life
1 Verduran Enchantress

You may now mock me

Good Stuff
White:  Peg. Charger, Pacifism, Weathered Wayf 
Blue:  Aven Windreader, Thought Courier, Sift, maybe levitation
Green:  Anaconda, Giant Growth, Giant Spider, Llan Elves, Rootwalla
Red:  Orc. Artillery, Volcanic Hammer
Black:  Bog Wraith, Consume Spirit, Dark Banishing, Enfeeblement

Things to mock in your deck:
Flight:  Crap.  Another creature is better
Evacuation:  Crap.  Your opponent can replay his creatures before you.
Sage Avegen and Lumegrid Warden:  These cards are (barely) playable but a good sign you should be looking in another color. 
Elvish Berserker:  A 1/1 with a bad ability = bad.  Zodiac monkey, a 2/1 for 1G with possible evasion = much better.
Stream of Life:  Very rarely, a lifegain card is worth playing because it is either extremely cost effiecient or repeatable.  This is not one of those cards.
Urza's Mine:  Maybe pretty to look, at but you will never, ever want to see it in a low-land opening hand.  Can only hurt your deck, never help it.   

What I would build:
Green is decent, as you noticed
1 Anaconda
1 Craw Wurm
1 Giant Growth
1 Giant Spider
1 Llanowar Elves
1 Naturalize
1 Reclaim - I don't always play this unless I'm low on creature removal, like your deck is.  Use this for getting back Volcanic Hammer and Dark Banishing. 
1 Rootwalla
1 Verduran Enchantress
1 Zodiac Monkey
1 Wood Elves - Not great but playable, and you have a few high casting cost creatures that can use it. 

Creeping Mold is out because you already have naturalize, and you can always sideboard it back in if you need to. 

Your Blue is too thin and lacks removal.  I'd go Black instead
1x Dark Banishing
1x Consume Spirit
1x Bog Wratih
1x Coercion - average card, good to side in if they have some bomb you otherwise have trouble with
1x Hollow Dogs - average creature filler
1x Enfeeblement
1x Giant Cochroach
1x Looming Shade - very average.  Be sure to pump one point at a time, to avoid cards like shock if all the pumps are on the stack. 
1x Rav. Rats
1x Mind Rot

Red:
1x Volcanic Hammer - Splashing for even a single burn spell is usually worth it, especially in a slow format like sealed (which is what league is)

Artifacts:
1x Phy Hulk - A nice fat body, this guy usually makes the maindeck.
I'm not sure about the Ring.  It'll win you some stalemates, but it'll also sit dead in your hand for at least 8-10 turns most games.  I say leave it out.     

Land:
8 Forest
8 Swamp
1 Mountain

When I splash a color, like red for the Hammer, I like to have at least two mana sources (be it a land or something like rampant growth), but both green and black are greedy here.   I thought about splashing for the pacifism but I don't think the mana base can support it.  Maybe if you get another pacifism or a Master Decoy in a later pack.   

[Margalis]

Damn I'm getting destroyed now. Too many people have bombs and I don't. Check out this set of rares:

Karplusan Forest - Pain Land
Blood Moon - Anti-non-basic land tech.
Millstone - Milling!
Will o' the Wisp - A blocker!
Utopia Tree - a bad birds!
Oracle's Attendants - another blocker!

No matter what I do my deck is just too slow and eventually someone gets out something I can't deal with, while I have nothing they can't deal with. Looking at my limited cards the closest thing I have to a bomb is probably Thieving Magpie or Nekrataal. I have a fair number of fyers but any deck I put together with them is just too slow and someone rolls me over.

I ran into one guy who had a Shard Phoenix. Another one I had beat until he pulled 2 lava axes while I was beating him down. Another guy had 2 Master Decoys, an Icy Manipulator, and Wrath of God. No way to do real damage without exposing yourself to Wrath and an automatic loss.

I can't say that any deck I played this week was worse than mine. Maybe the guy who got the 2 lava axes. I dunno, maybe I should make a red/blue deck with flyers and firebreathing or something...my only hope is something novel because my card power just isn't there.