Sinuous Vermin

one generic mana one black mana Creature — Rat HorrorPower and toughness2/2

three generic mana one black mana : 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.)

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Showing Jumpstart 2022#466

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11 printings

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Sinuous Vermin rulings

2016-08-23
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 keyword rules

Monstrosity Rule 701.31

“Monstrosity N” means “If this permanent isn’t monstrous, put N +1/+1 counters on it and it becomes monstrous.”

Monstrous is a designation that has no rules meaning other than to act as a marker that the monstrosity action and other spells and abilities can identify. Only permanents can be or become monstrous. Once a permanent becomes monstrous, it stays monstrous until it leaves the battlefield. Monstrous is neither an ability nor part of the permanent’s copiable values.

If a permanent’s ability instructs a player to “monstrosity X,” other abilities of that permanent may also refer to X. The value of X in those abilities is equal to the value of X as that permanent became monstrous.