Akala, Songstress of Zahri

Lieutenant - As long as you control your
commander, Akala gains this ability "Tap three
merfolk: Search your library for a merfolk with
converted mana cost equal or less than the amount
of reef counters on the battlefield, shuffle your
library, and place it on top. You may only use this
ability once per turn"
{2}{g/u}{g/u}, {t}: Draw a card.
Her song brings merfolk to the reef, and humans to
the shore...