Kazuma, Unfortunate Leader

{w}{w}{w}: Untap up to 2 legendary creatures
you control.
{u}{u}{u}{1}{t}: Target legendary creature is
unblockable until end of turn.
{r}{r}{r}{2}{t}: Gain control of target artifact
until end of turn.
{b}{b}{b}{3}{t}: Sacrifice a nonland permanent,
then you may cast a spell with equal or lesser
mana value from your hand without paying
its mana cost. That spell has cascade.