Saria's Song

Convoke (Your creatures can help cast this spell.
Each creature you tap while casting this spell
pays for {1} or one mana of that creature's color.)
Search your library for a creature card with
converted mana cost less than or equal to X,
reveal it, and put it into your hand. If Saria's
song was convoked by three or more creatures
put that card onto the battlefield instead.