Hama, the Bloodbender

When this creature transforms into Hama, the Bloodbender, gain control of target creature you
don't control of each opponent. Untap them and
they gain haste until end of turn. You have
control of the creatures while Hama, The Bloodbender is on the battlefield.
{6}{b}: This ability costs {1} less for each creature
of your opponents you control. Exile target card
from an opponents graveyard. You may cast it
until end of turn without paying its mana cost.