The damage-dealing trigger of Ravager of the Fells Flip is an ability of the Ravager. Since the Ravager is a green and red creature (thanks to the color indicator on the type line), the ability is coming from a red and green source and therefore cannot target a creature with protection from all colors.
In short: No, the Ravager couldn't have killed the Etched Champion in this scenario.
January 28, 2015 8:57 p.m.
Yes, Ravager of the Fells Flip is a considered a red and a green creature after it has transformed. Although there are no mana symbols to show this, the color indicator is shown to the left of the creature type does.
January 28, 2015 8:58 p.m.
Drilnoth I was really hoping it could. I had the etched champion and a kid told me it dealt damage as a colorless creature. I should have won the match instead I 0-1 dropped. Thanks for the ruling guys.