Cheapest priced copy (Conspiracy: Take the Crown): $0.35 at Card Kingdom, near mint, their price list as of .
Sinuous Vermin 
Creature — Rat Horror · 2/2 · Common · Jumpstart 2022 · #466
{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.)
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Conspiracy: Take the Crown | 46 | Common | $0.35 | $0.49 |
| Jumpstart 2022 | 466 | Common | $0.39 | — |
One ruling from Wizards of the Coast
- 23 August 2016Once Sinuous Vermin has been legally blocked by one creature, activating the monstrosity ability to give it menace won’t change or undo that block.