Forgotten Monstrosity

{t} Untap another target creature
{7}: Forgotten Monstrosity becomes a 9/9 black Skeleton Giant with trample, first strike, and protection from blue until end of turn. If Forgotten Monstrosity dies this turn, destroy up to five target creatures you don't control and those creatures controllers lose 5 life.
The Death Callers best reanimation, its was lost in a war after it went wandering off. He never found it until now.