Sephiroth, Prince of Ruin

First Strike, Haste
If Sephiroth, Prince of Ruin destroys a creature by battle, untap this creature and after this phase,
there is an additional combat phase, but only this creature can attack during that phase.
"They slaughtered every person in the kingdom while
he was gone. As soon as he returned during the assault,
he showed them that leaving him out of the picture was
the right idea."