An interesting format, to say the least. Some first thoughts:

Library of Alexandria - Broken, unrestricted. Bad mistake for a "cheap" format. Crop Rotation is a common, too.

Sol Ring - Overpowered. Especially in fours.

Channel - Only non-broken because of Sligh.

Maze of Ith - Very powerful in a creature format. If I remember correctly, it was a C1 in Dark. Does C1 count as uncommon?

Zuran Orb - May not be completely broken without Balance...

All in all, I'd expect to see almost all decks except the fastest weenies use either four Libraries or four Sol Rings. A big critter green deck could concievably use 4 Rings, one Library and 4 Crop Rotations to have both broken card advantage and broken mana acceleration.

Defense / control has some interesting tools, but no blanket defense except Circles of Protection. Blue-White defense decks could work, but are impossible to build without knowing the metagame. Draw-Go with four Libraries, AccuKnowledge and Merchant Scroll would seem powerful, but it needs a way to clear the table. Well, someone will find a way to break it; they always do.

A couple decks to test:

Sligh, fairly close to a T1 version. Very, very fast. It loses some of the staple creatures and the Wheel of Fortune, but nothing else. Gains three Strip Mines to make up for it.

16 Mountain

4 Strip Mine (Worth the uncommon slots; cheap harassment is great for this deck)

(20)

4 Goblin Patrol

4 Mogg Fanatic

4 Raging Goblin

4 Mogg Flunky

1 Jackal Pup

(17)

4 Fireblast

4 Incinerate

4 Lightning Bolt

4 Chain Lightning

4 Goblin Grenade

3 Reckless Abandon

(23)

---

A black weenie, with a powerful card advantage engine. May be overwhelmed before the card advantage kicks in; might benefit from some bigger creatures + Pestilence.

4 Hymn to Tourach

4 Library of Alexandria

(Card advantage)

(8)

4 Sinkhole

4 Duress

(Random disruption, powerful with dard drawing)

(8)

4 Carnophage

4 Dauthi Slayer

4 Dauthi Horror

4 Skittering Skirge

(Cheap, powerful evasion creatures)

(16)

4 Snuff Out

4 Vendetta

(Defense chosen over more creatures, to buy time for the card advantage)

(8)

1 Demonic Tutor

19 Swamp

(20)

---

An attempt to abuse the broken Library. Main problem is the offense part; how to kill in the long run while still surviving to abuse the card drawing? Perhaps more mana acceleration would help.

4 Library of Alexandria

4 Crop Rotation

(8, Drawing engine)

10 Forest

10 Mountain

(20, Basic land)

4 Lightning Bolt

4 Incinerate

4 Fireball

4 Ghitu Slinger

1 Maze of Ith

(17, defense)

3 Yavimaya Wurm (Big, mean)

4 Blastoderm (Huge in this format)

4 River Boa (Regenerates, efficient)

4 Llanowar Elves (Acceleration)

(15, offense)

Yours truly,

grimJester