You can only play Sephiroth if either player has received 4 points of damage or more.
When Sephiroth enters the field, choose 1 Character. Break it.
%Octaslash% {s}: Choose up to 1 Forward, up to 1 Backup, and up to 1 Monster. Remove them from the game. You can only use this ability if each player has received 5 points of damage or more.