Aboleth of the Dread Sea

Islandwalk
{u}{u}{b}{b}, {t}: Gain control of target creature
with converted mana cost of 4 or less.
{4}: Gain control of target creature that Aboleth
of the Dread Sea's controller controls that you
own. Aboleth of the Dread Sea's controller draws
a card and creates two Treasure tokens. Only an
opponent may activate this ability.