Lord of the Assassin Circle

Rank IV - Master
Deadly Strike, Alert, Stealth
Force Plague {b}{b}{b} (Place three -1/-1 counters on
a Being or Creature card, then tap it permanently.
Place a -1/-1 counter on the tapped card each turn.)
Force Kill {r}{r}{r}{r} (Target a Being or Creature
card on the field and permanently reduce its defense
value by -6.)