Does it mean he is wrong always? No.
Does it mean he is wrong in this instance? My opinion is that he is.
And I'm willing to question the Color Pie, by adding breaks here and there.
Would this work?
Imprisoned In The Wall - 1W
Artifact - Uncommon
When ~ enters the battlefield exile target nontoken creature you control until ~ leaves the battlefield.
T: Add W. Activate this ability only if a card is exiled with ~.
My nitpicks are:
- That there should be an Aura or Enchantment version of Master Armorer.
- Boros Recruiter doesn't produce RW - Admittedly it's a flavor nitpick
- What does W stand for in "Creature - Human Soldier - W" (from Boros Recruiter). Common?