My Five Color Apprentice Deck

[Griffion2000]

Alright here is my deck list:
4 - Thornscape Apprentice
4 - Thunderscape Apprentice
4 - Stormscape Apprentice
4 - Sunscape Apprentice
4 - Galina’s Knight
4 - Llanowar Knight
4 - Vodalian Zombie
4 - Barbarian Zombie
4 - Ancient Spring
4 - Geothermal Crevice
4 - Irrigation Ditch
4 - Sulfur Vent
4 - Tinder Farm
2 - Forest
2 - Island
2 - Plain
2 - Mountain
2 - Swamp

The idea of the deck is to attack with the goldies and do minor spell effects with the apprentaces.

I didn't include the Nightscape Apprentice because first strike and unsummon are the weaker of the five abilities, and the Nightscape is stuck with both.
I didn't include the Yavimaya Barbarian because Protection from Blue is pretty useless compared to the other ones.
You may think that the sac. land would slow down my deck because they come into play tapped, but 16 spells cost 1 mana, and 16 spells cost 2 mana.
I didn't want to include harrows or that land-changing bird because I included 8 land instead.

So, what do you think my deck could use. I want to keep this an all Invasion deck. Constructive critizism could be helpful.