I know R&D has done a lot to try to beef up green in the past few years, since it was suffering from a very narrow color identity. This has been quite successful, with a number of different kinds of green decks having shown up in the past few years—Elves, Birthing Pod, Primeval Titan decks, and so on.
However, another color has gotten narrower. Ever since the removal of Stone Rain from red, the color has become very narrow and one-dimensional in tournament play. It is now the color of nothing more than speedy aggro, with the occasional appearance of blue control decks using it for creature kill. Splinter Twin—a combo which R&D admits to having missed—is the lone exception to this in recent memory.
Is this R&D's intention, or are there plans in the works to give red other kinds of approaches? Can you give us any hints on what to expect from red in the future besides more cheap burn?
TheCid on /r/magictcg
A: From Mark Rosewater, Head Magic Designer
Let me start by clarifying that you are combining two color pie issues: what can each color do and what can each color do that development is willing to push for Constructed. I can talk a lot more about the first than the second as design is very involved with the overall color pie because we have so many cards to design but I am much less involved in what gets pushed for Constructed. As an example, red still has the ability to destroy lands. What has changed is R&D's willingness to aggressively cost land destruction.
All that said, I do agree that red has the narrowest slice overall of color pie. Red's schtick is that it gets things that have the widest execution meaning that red can do a few things that we can make a lot of cards out of—direct damage being the best example. Where red gets the most pinched right now is in common spells.
Red has enough option that it isn't hard designing creatures but red is very limited with spell options. That is why we've been looking for other things red can pick up. The most recent addition has been allowing red (and blue—it's not leaving blue) access to looting—aka drawing and discarding cards. As you will see when all the Avacyn Restored cards are public we've started to define how red looting is different from blue. (Hint: different order of the effects.)
As to what development is doing to broaden red's depth in Constructed, that's a little out of my area.