Raiden, Jack the Ripper

Menace
When Raiden enters the battlefield, each opponent sacrifices a creature with the highest power among creatures they control.
Whenever a creature an opponent controls dies, if it had greater power than Raiden, put a +1/+1 counter on him.

{1}{b}, Sacrifice another creature: Raiden gains indestructible until end of turn.

"You don’t bring peace by covering your hands in blood... You just get better at cutting."