Artifact creature like vault Skirge

[Achgook]

If I give a creature pro black can vault Skirge still be declared as a blocker

[Thorn]

This should be in Rules. and the answer is the skirge cant block.

[Sagemaster]

Yea he can block if he's pro black, but he can't be blocked by black creatures. He won't take any damage from black creatures if you pro black him

[Gorzo]

If the question is if {vault skirge} is considered a black creature, the answer is yes. To determine a card's color, look at its mana cost. If it contains a color (Phyrexian or not), in this case black, the creature is considered that color(s). So, as a black creature, vault skirge cannot block a creature with pro-black.

Normally to clarify with colored artifacts like this, the card has a thin sub-border of its color between the gray artifact background and the card art border. See the green in {birthing pod} for example. But if that color stripe is the same black as the border, like with the skirge...kinda can't see that it has any meaning other than a border.