Update: I've finally created my first Magic: The Gathering Library

[ReptilianPeon]

It's not exactly my first (and I do have experiences with several other TCGs). My first was an intro Pack from over two years ago, which I recently cheaply upgraded with singles from a local store in order to try out the game. Most of the below cards were released in the set Coldsnap, which was released in 2006. All of the below cards should be legal in the Modern format (I checked the legality of Coldsnap). If any aren't, do kindly point out. Clicking on the links takes you to the correct http://gatherer.wizards.com page for further details on that card.

The Library has sixty cards in total. It focuses on Snow cards. Hence the four Scrying Sheets.

Lands cards (25):

Snow Land (5):

1 Mouth of Ronom
4 Scrying Sheets

Basic Snow Land (20):

12 Snow-Covered Forest
8 Snow-Covered Mountain

Creatures (25):

(SC) = Snow Creature*, for a total of 19 of 25 (includes 1 Snow Artefact Creature).
*http://gatherer.wizards.com/Pages/Search/Default.aspx?output=compact&sort=cn+&type=+[%22Snow%22]+[%22Creature%22]

Green (15):

2 Bull Aurochs
2 Tinder Wall
4 Boreal Druid (SC)
3 Frostweb Spider (SC)
4 Boreal Centaur (SC)

Red (9):

1 Ohran Yeti (SC)
2 Orcish Lumberjack
4 Goblin Rimerunner (SC)
2 Rimescale Dragon (SC)

No particular colour:

1 Phyrexian Snowcrusher (SC, Artefact)

Other Spells (10):

Green (4):

2 Resize (could be replaced with Titanic Growth)
2 Bounty of the Hunt

Red (4):

4 Incinerate

No colour (2):

2 Extraplanar Lens (or Strata Scythe)