Is Sinuous Vermin legal in Standard, Modern, and Commander?

Sinuous Vermin is legal in: Legacy, Vintage, Commander, Pauper.

Sinuous Vermin

Q: What type of card is Sinuous Vermin?

Sinuous Vermin is a Creature — Rat Horror. Its oracle text reads: "{3}{B}{B}: 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.)"