Maybe this reality is actually an alternate reality of a reality in which New Phyrexia was the joke expansion and Mirrodin Pure was the obvious expansion, except our reality is the Time Shifted reality which is opposite of that other reality which is that actual reality.
A single color. Wild Mongrel does exactly what it says it does, and nothing more. It says "color" as in singular. If something can be changed to multiple types and colors, it will say that it can
Level 1 Judge. I tweet. Member of clan <Limited>. The Dunning-Kruger effect.
Ex-DCI Level 1 judge
Ex-Rules Advisor
One card gets you one color.