I don't know how precedent setting it is, but Stranglehold prevents extra turns and is in Red.

That’s a weird card to be red. I wouldn’t use it as precedent. Red’s not really a rule setting color. EDIT: It is hating on two very blue things, and red needed it more than green in Commander. That’s how it ended up in red.

Can’t white go in the opposite direction with things like Spirit of the Labyrinth which stop opponents from drawing extra cards? Could Stranglehold be printed in white?

It’s in white color pie, but we have to be careful how much of the game is restricting other people from doing things.

Maro, what if you worded extra turn cards as this: if your next turn is not an extra turn, take an extra turn. Something like stranglehold or Medomai, that would allow recursion but not abuse.

Let me be more blunt. We don’t want recursion of extra turns.

"If you want red to feel more emotional, find spells that have some emotional resonance." What red spells do you feel exemplify emotional resonance? Stranglehold? Anger? Lash Out? Lightning Bolt? Ball Lightning? I can see how the title of a card would clearly convey an emotion, but that feels like good branding, rather than good design. What are cards whose designs have clear emotional resonance? Do cards have intrinsic resonance outside the context of the metagame or personal history?

EDIT: TUMBLR’S HAVING ISSUES. THE REAL QUESTION WAS WHY DOES NICOL BOLAS HAVE RED IN HIM? I think the red got in their to portray his dragon-ness. Personally, I don’t see a lot of red in Nicol Bolas personality-wise. He is not at all impulsive and doesn’t tend to let his emotions drive his decisions.