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@Keeper
The myriad of random recursion effects in Innistrad were more to make gameplay less repetitive than anything. 

Polymorph is meant to be blue. Blue turns things into other things.

If it wasn't meant to be blue, they would have put it into its proper color by now - they're not afraid to do that. At the very least, they wouldn't be reinforcing this ability by printing new cards like Rapid Hybridization .

MaRo even said that he thought Beast Within should have been blue.


Now it might be true that Grip of Chaos is the only real precedent for its own ability. But I would argue against the idea of putting the entire concept of randomness into a single color. It is a very big concept, even if it only appears on a small number of cards. (The reason for that is because there's enough randomness in the rules of the game like shuffling your deck that we don't need more on the cards themselves. You could argue that Divination is a random effect since at the start of the game you randomly determined what those two cards would be!) If they did decide to put more random effects in the game, they would put them into more colors ( Tavern Swindler was a good example of how you don't have to be red to flip coins), and random effects that had to do with targetting of spells would be in the spell colors (blue and red).

Randomness can be used in a clever way even if it's normally flavored as stupid goblins taking risks. You can say that "the worst that could happen by this risk is less likely and/or is still not as bad as what would happen if I didn't take the risk." That's what players do in Magic all the time, even blue players, but you trying to say that their cards can't do that?
Another pretty random ability is clash, but that appears in all colors. 

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