Killer, of the Silent Way

Ninjitsu {2}{w}{u}
Killer deals double damage to players as long as he has entered the battlefield this turn.
Killer assigns combat damage first. If Killer would fight a creature, he deals damage first. If that creature would die, it doesn't deal it's damage. Killer can't be blocked unless blocked by 3 or more creatures. When Killer is blocked, it deals it's combat damage equal to it's power to each creature equal to it's power. Killer does double damage to creatures.
If a spell or ability an opponent