Would you consider "this creature has flying as long as it's untapped" to be a bend or break in green? It's effectively reach unless you have a way to untap it.

Flying isn’t a break in green, but I’m skeptical we’d use that text.

Is wild magic surge a bend or break? It removes enchantments, but the fact that the replacement will be an enchantment makes me think maybe it’s okay?

We decided red can turn an enchantment into another random enchantment in your deck, although it’s not something we plan to do often.

One of black’s major weaknesses is that it can’t remove artifacts. Despite this, it’s gotten cards that say “exile target vehicle” because vehicles are very very similar to creatures, so it’s not much different from its ability to remove creatures. Assuming this is an ability that can be used as precedent rather than a major bend or break, then in that same vein would black removing clues be allowable as an extension of its discard abilities? Or is that a step too much into the artifact-removal direction? If it is too far, what would you say makes it different from the vehicles example?

That’s a step too far.

Would a blue spirit guide that can only cast instants and sorceries be a bend or break?

It’s somewhere between a strong bend and a break. The closest blue can get is an effect that makes instants and sorceries cost 1 less for the rest of the turn.

Id self-untap like Simic Ragworm a bend or break in mono-Green?

If you spend colored mana, you can get effects of that color. Blue can have creatures that activate to untap, so its not an issue. Green does get a little bit of untapping, but more on boosting spells to allow it to block.

Speaking of mass fight/bite in green, is Ezuri's Predation a break? It feels to me like it combines two green things (large token creation and fight effects) to get a not-green thing (removing opponents' creatures without using your own (that are already on the battlefield)).

It’s either very strong bend or break.

My birthday trivia was lost earlier this month so I'll ask a different question. Are things that a color used to do that they don't do anymore considered a bend or break from a design perspective, like for example how black used to have rituals or how blue used to do ping damage?

Having done it before doesn’t really change anything. Early Magic has all sorts of out of pie cards.

On the topic of red color pie: Mana Echoes feels out of place for red, one of my favorite cards but is it a bend or break? (however in a balance sense I know any othwer color with it would be broken, except maybe black but i just like zombies loll)

I think it’s in color pie, at most a slight bend. Red is number two in mana production.

You’ve said that blue isn’t supposed to get creature removal like Pongify anymore, the transformations should either be temporary or on auras. That being said, is phasing of zhalfir a bend or break? It’s basically just a mass Pongify, and since it’s it’s from DMR, half the time it’s just a sorcery that only says the third chapter

It’s a major bend on the third chapter of a Saga. Things can slip through as we’re phasing things out of colors (pun intended, of course).

Any chance of getting a supplemental set that has cards with off color effects like in Planar Chaos?

A very low chance of ones that severely bend or break the color pie.