Planeshifted Font Color

In a text editor (notepad++ is nice), open the "style" file in the folder for the style template you want to change.
Find the entries for the "Name" and "Type" fields.  They will look something like this.

name:
left: 32
top: 30
right:  { 341 - card_style.casting_cost.content_width }
height: 23
alignment: bottom shrink-overflow
padding bottom: 0
z index: 1
font:
name: Beleren Bold
size: 16
color: white
type:
left: { if has_identity() then "52" else "32" }
top: 296
width: { (if has_identity() then "290" else "310") - max(22,card_style.rarity.content_width) }
height: 20
alignment: top shrink-overflow
z index: 1
padding top: 2
font:
name: Beleren Bold
size: 13
color: white
separator color: red

Next, replace the lines that says "color: white" with this:

color: { if card.card_color == "white" then "black" else "white" }

And save; make sure that the file is still called "style" without a file extension. So if it is "style.txt", delete the ".txt" from the name.
That should accomplish what you are requesting.

EDIT:  I just realized you may have been asking for the name and typeline to be black text for all cards, rather than just white cards.  If that is the case, then you can instead change the line to:

color: black