Sinuous Vermin — ruling 1

Once Sinuous Vermin has been legally blocked by one creature, activating the monstrosity ability to give it menace won’t change or undo that block.

Sinuous Vermin : règles, fonctionnement et interactions (MTG)

Sinuous Vermin 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

: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.) As long as this creature is monstrous, it has menace. (It can't be blocked except by two or more creatures.)

How it works : Sinuous Vermin

Original English text — Wizards of the Coast / Scryfall

#1August 23, 2016· Wizards of the Coast
Once Sinuous Vermin has been legally blocked by one creature, activating the monstrosity ability to give it menace won’t change or undo that block.
No other card is named in this ruling.