First off, there's no real need for blue mana. Both of those abilities are more or less mono-green. Yes, the first has been done in green/white (Altar of Bone, Eladmri's Call), but it's been done in monogreen a lot more (Bifurcate, Chord of Calling, Fierce Empath, Survival of the Fittest, Worldly Tutor, Sylvan Tutor). And the second is clearly green (Elvish Piper, Norwood Priestess, Root Elemental).
Secondly, it's so very cheap. Worth a lot more than two mana, even two mana of different colours. I'm thinking
at least 
{G}{G}.
Finally, a few wording issues -
When Elf Caller comes into play, search your library for a creature card, reveal it, and put it into your hand. Then shuffle your library.

: Put a creature card with converted mana cost 2 or less from your hand into play.