Rogue Assassin

Deathtouch, bushido 2, killer 4 (When this card attacks, defending player loses 4 life)
When Rogue Assassin attacks, destroy {x}
creatures defending player controls.
If card named The System is on the battlefield,
Rogue Assassin loses bushido 2 and killer 4, gets vigilance and can't use abilities.
{x}, {t}: Destroy target creature.