When transformed the card is the color(s) that their COLOR INDICATOR shows, the color indicator is a small a circle that is to the left of the card type line under the illustration. Its two sides are independent on each other and dont affect what the other side may be.
In the case of Ormendahl (westvale abbey) the color indicator is black so it is a black card.
In the case of Avacyn the Purifier (Archangel Avacyn) she is red.
The transformed side's border has up to now always matched to the color indicator.
It is worth pointing out that the color(s) of both sides of a double faced card are taken into account when looking at color identity for commander.
So Archangel Avacyn is white and Avacyn, the Purifier is red, the color identity for the card is white and red. Therefore, it can only be played in commander decks that are both white and red.
Likewise, Westvale Abbey/Ormendahl, Profane Prince can only be in commander decks that with access to black.
Also, What color is Archangel Avacyn when she flips? I was thinking she was still White.
In the case of Ormendahl (westvale abbey) the color indicator is black so it is a black card.
In the case of Avacyn the Purifier (Archangel Avacyn) she is red.
The transformed side's border has up to now always matched to the color indicator.
So Archangel Avacyn is white and Avacyn, the Purifier is red, the color identity for the card is white and red. Therefore, it can only be played in commander decks that are both white and red.
Likewise, Westvale Abbey/Ormendahl, Profane Prince can only be in commander decks that with access to black.
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