My last list:

Lands:

1 Island
1 Serra's Sanctum
2 Tropical Island
3 Misty Rainforest
4 Windswept Heath
7 Forest

Kills:

1 Emrakul, the Aeons Torn
1 Words of Wind
1 Tendrils of Agony

Accelerating:

4 Argothian Enchantress
4 Enchantress's Presence
1 Abundant Growth
4 Cloud of Faeries
4 Utopia Sprawl
4 Wild Growth
4 Gaea's Touch
3 Cloudstone Curio

Control/others:

1 Eternal Witness
1 City of Solitude
1 Sylvan Library
4 Elephant Grass
4 Seal of Removal

Sideboard in building...

What's new?
- Gaea's Touch: This card is very powerful in this deck. It make UG Enchantress more explosive! It's a "free" enchantment (because you can sac it to have ) and allow to put an extra land. You can easily have 15mana around turn5.
- Tendrils of Agony: It's very easy to cast it with 7-8spells (don't need more because opponents have mostly 16-18hp) with CloudStone. The mana is simple with the moving of utopia and abundant growth.
- Sylvan Library: To have more cards in hand (by sac some hp) to start combo more quickly.

From a friend in a tournament (2nd on around 20 players) with a similar deck (with 2 words of wind and 2 cloudstone) :
- He found Cloudstone better than Words of wind (1/8 round won with Words and 7/8 rounds won with CloudStone+Tendrils), so he will cut a word for an additional cloudstone.
- He found Gaea's Touch very useful (before tournament, he tested it with one slot and he discovered its power, so he added more Gaea's touch for tournament).

I suggest you to try Gaea's touch.

Regards,
Dihensoeur