Zarika, Ascended Princess

Flash
If Zarika is your commander every blue and green
creatures you draft is an elf in addition to its other
types.
When you cast an elf look at the top 3 cards of
your library you may cast an elf from among them
for {1} less its mana cost. if you don't you may put
one of those cards into your hand. put the rest on
the bottom of your library in a random order