Is "Can't be countered" for both this and the all creatures bonus in color pie?

I don't think so. "Can't be countered" in red is an instant-and-sorcery ability, not something usually done o permanents. Akroma would be the only monored precedent.

Agreed. Or a multicolor involving Green or Blue. I don't think it's necessary for this one.

If were really wanted to push for it, we could make the precedent within reason, but I don't think we need to add that text.

I will admit I missed it was Renown 2. Thus I was looking at ways it could be a little more interesting in constructed. However the current design is certainly solid.

I kinda want to mention Vexing Shusher is playable in monored decks as a "monored" way of stopping your creatures being countered. But. Even though in theory hybrid cards are effects that are accessible to both colours, there's often a little bit of bleed on each side. A white Relentless Assault would be a bit strange, even though Waves of Aggression felt okay for .

So I'm not actually going to claim Vexing Shusher is very sensible precedent.

http://archive.wizards.com/Magic/magazine/Article.aspx?x=mtg/daily/mm/214 seems the best description of "can't be countered" colour pie I've seen. Apparently it is supposed to be red spells and green creatures. But if there's a red creature that wants it, I would let it bleed. (I agree, it's probably too much text for this on top of its other abilities.)