Air Applier

At the beginning of each end step, if this creature
is untapped, you may pay {u} and tap it. If you
do, create a 2/3 blue Elemental creature token
with flying. Exile it at the beginning of your next
end step.
{3}{u}, {t}: Return target creature to its owner's
hand.
_________________________________________
Many merfolk wizards practice water magic, but a
few gain mastery over air currents.