Octavia, Anthem of Ruin

Energize 2 —When Octavia, Anthem of Ruin
enters the battlefield, you get {e}{e}.
Pay {e}: Each creature attacking you deals
damage to itself equal to its power.
Pay {e}{e}: Create Rollerball, a legendary 0/2
colourless Construct creature token with
"Whenever this creature attacks, all creatures
able to block it this turn do so."