Loathsome Catoblepas

Text:

: Loathsome Catoblepas must be blocked this turn if able.
When Loathsome Catoblepas dies, target creature an opponent controls gets -3/-3 until end of turn.

Rulings:

• 9/15/2013 If Loathsome Catoblepas is attacking and its activated ability has resolved, the defending player must assign at least one blocker to it during the declare blockers step if that player controls any creatures that could block it.
• 9/15/2013 The activated ability doesn’t target any creature or make any specific creature have to block. Activating it more than once in a turn provides no additional benefit.