Culvert Ambusher

three generic mana one green mana Creature — Wurm HorrorPower and toughness4/5

When this creature enters or is turned face up, target creature blocks this turn if able.

Disguise four generic mana one green mana (You may cast this card face down for three generic mana as a 2/2 creature with ward two generic mana . Turn it face up any time for its disguise cost.)

The bite at the end of the tunnel.

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Showing Murders at Karlov Manor#158

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16 printings · up to 0.15 $

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Culvert Ambusher rulings

2024-02-02
If the target creature is tapped or is affected by a spell or ability that says it can't block, then it doesn't block. If there's a cost associated with having that creature block, its controller isn't forced to pay that cost, so it doesn't have to block in that case either.
2024-02-02
A disguise ability lets you cast a card face down by paying and announcing that you are using a disguise ability. Any time you have priority, you can turn a face-down permanent with disguise face up by paying its disguise cost.
2024-02-02
The face-down spell has no mana cost and a mana value of 0. When you cast a face-down spell, put it on the stack face down so no other player knows what it is, and pay to cast it. This is an alternative cost.
2024-02-02
The creature spell is a 2/2 creature spell with ward that has no name, mana cost, or creature types. The resulting creature is a 2/2 creature with ward that has no name, mana cost, or creature types. Both the spell and the resulting creature are colorless and have a mana value of 0. Other effects that apply to the spell or creature can still grant it any characteristics it doesn't have or change the characteristics it does have.
2024-02-02
Any time you have priority, you may turn the face-down creature face up by revealing what its disguise cost is and paying that cost. This is a special action. It doesn't use the stack and can't be responded to. Only a face-down permanent can be turned face up this way; a face-down spell cannot.
2024-02-02
At any time, you can look at a face-down spell or permanent you control. You can't look at face-down permanents or spells you don't control unless an effect instructs or allows you to do so.
2024-02-02
If a face-down creature loses its abilities, it can't be turned face up with a disguise ability because it will no longer have a disguise ability (or a disguise cost) once face up.
2024-02-02
Because the permanent is on the battlefield both before and after it's turned face up, turning a permanent face up doesn't cause any enters-the-battlefield abilities to trigger.
2024-02-02
Because face-down creatures don't have a name, they can't have the same name as any other creature, even another face-down creature.
2024-02-02
A permanent that turns face up or face down changes characteristics but is otherwise the same permanent. Spells and abilities that were targeting that permanent and Auras and Equipment that were attached to that permanent aren't affected unless the new characteristics of the object change the legality of those targets or attachments.
2024-02-02
Turning a permanent face up or face down doesn't change whether that permanent is tapped or untapped.
2024-02-02
If a face-down spell leaves the stack and goes to any zone other than the battlefield (if it was countered, for example), you must reveal it. Similarly, if a face-down permanent leaves the battlefield, you must reveal it. You must also reveal all face-down spells and permanents you control if you leave the game or the game ends.
2024-02-02
You must ensure that your face-down spells and permanents can be easily differentiated from each other. You're not allowed to mix up the cards that represent them on the battlefield to confuse other players. The order in which they entered the battlefield should remain clear, as well as what ability caused them to be face down. (This includes disguise, cloak, and in games involving older cards, morph and manifest, as well as a few other effects that turn cards face down.) Common methods for doing this include using markers or dice, or simply placing them in order on the battlefield.

Culvert Ambusher keyword rules

Disguise Rule 702.168

Disguise is a static ability that functions in any zone from which you could play the card it’s on, and the disguise effect works any time the card is face down. “Disguise [cost]” means “You may cast this card as a 2/2 face-down creature with ward {2}, no name, no subtypes, and no mana cost by paying {3} rather than paying its mana cost.” (See rule , “Face-Down Spells and Permanents.”)

To cast a card using its disguise ability, turn the card face down and announce that you are using a disguise ability. It becomes a 2/2 face-down creature card with ward {2}, no name, no subtypes, and no mana cost. Any effects or prohibitions that would apply to casting a card with these characteristics (and not the face-up card’s characteristics) are applied to casting this card. These values are the copiable values of that object’s characteristics. (See rule , “Interaction of Continuous Effects,” and rule , “Copying Objects.”) Put it onto the stack (as a face-down spell with the same characteristics), and pay {3} rather than pay its mana cost. This follows the rules for paying alternative costs. You can use a disguise ability to cast a card from any zone from which you could normally cast it. When the spell resolves, it enters the battlefield with the same characteristics the spell had. The disguise effect applies to the face-down object wherever it is, and it ends when the permanent is turned face up.

You can’t normally cast a card face down. A disguise ability allows you to do so.

Any time you have priority, you may turn a face-down permanent you control with a disguise ability face up. This is a special action; it doesn’t use the stack (see rule ). To do this, show all players what the permanent’s disguise cost would be if it were face up, pay that cost, then turn the permanent face up. (If the permanent wouldn’t have a disguise cost if it were face up, it can’t be turned face up this way.) The disguise effect on it ends, and it regains its normal characteristics. Any abilities relating to the permanent entering the battlefield don’t trigger when it’s turned face up and don’t have any effect, because the permanent has already entered the battlefield.

If a permanent’s disguise cost includes 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 chosen as the disguise special action was taken.

See rule , “Face-Down Spells and Permanents,” for more information about how to cast cards with a disguise ability.