Why would it even need a coin flip at that cost?

Honestly, I'm all for coin flip cards, but don't make them so unnecessarily pointless.

What did they want to accomplish with this? It's like they just wanted to tell players:
"See? Red is one crazy unpredictable color. Also, it sucks at doing some of green's jobs."

"Uncommon? Seriously?" --Dregrage
I guess they don't want coin flips to pop up too frequently in limited. Wordy and/or time-consuming commons are the exception. Although with today's smart phone coin flip apps, this shouldn't be a problem anymore.