Lesser Werewolf — ruling 1

You may activate Lesser Werewolf’s ability no matter what its power is. However, if Lesser Werewolf’s power is 0 or less at the time the ability resolves, the ability won’t do anything.

Lesser Werewolf : règles, fonctionnement et interactions (MTG)

Lesser Werewolf is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

: If this creature's power is 1 or more, it gets -1/-0 until end of turn and put a -0/-1 counter on target creature blocking or blocked by this creature. Activate only during the declare blockers step.

How it works : Lesser Werewolf

Original English text — Wizards of the Coast / Scryfall

#1October 1, 2009· Wizards of the Coast
You may activate Lesser Werewolf’s ability no matter what its power is. However, if Lesser Werewolf’s power is 0 or less at the time the ability resolves, the ability won’t do anything.
No other card is named in this ruling.