Heres my elf deck:
The main idea of this Elf deck is to gain life like crazy while inficting major damage to your opponents life. All of the low cost, Mana producing elves get you forces built up fast while your wellwishers gain you tons of life.
but there also an offensive side to this elf deck. While your side is full of elves you can use timberwatch elves to boost the living hive by amazing amounts. since he is a trample that produces a 1/1 token for every one damage to someones life, this can quickly overrun someone. Timberwatch also goes good with Tree top scout.
Another plus to this deck is that lots of its components are artifact hate. The Virdian Shaman destroys an artifact as it enters the field. The Tel-Jilad Archers and chosen have protection from artifacs and the Archers block as though the have flying.
Overall this Elf deck has great Offensive and Defensive capabilities. Enjoy!!