"Look, if you ignore the color pie once in the casting cost, you might as well do so again in the flashback cost."

SecretInfiltrator, I don't think you understand how color pie works on a fundamental level. For the most part, colorless can do anything. There is a difference between a mono-blue deck having access to something blue can't do (which is totally fine), and having a blue spell do something blue can't do (not fine) There are plenty of cards that let you do burn without red mana: Staff of Nin Gut Shot Acorn Catapult Aeolipile Aetherflux Reservoir Ankh of Mishra Blazing Torch Fireforger's Puzzleknot Fodder Cannon Mage-Ring Responder Masticore Meteorite Molten-Tail Masticore Moonglove Extract Mortarpod

Do you consider all of those to be color pie breaks?

If you're going to leave feedback in a sarcastic non-constructive manner, at least know what you are talking about. Sorry if this is a bit harsh, but you seem to think you know more than you actually do, and that kind of thing annoys me.

This comes back to the role of colorless cards in the color pie. To a certain extend, yes, I would consider all of those color bleeds though maybe not outright breaks.

From what I can gather, SecretInfiltrator (and many other people) holds a view that these colorless cards are fine as long as they aren't powerwise better than the effect's actual holding color equivalent. I don't care for that since power levels fluctuate all the time so something that was bad when compared to the other cards in the environment could easily be better than the colored equivalent with the same effect in a less powered environment.

That being said, there's also talk about how color pie is not actually related to the color of mana spend to cast the spell, but more like color identity, which is just ludicrous to me. With that idea I don't even know if this card would fall under "colorless pie" scrutiny.

MaRo has said that powerlevel is not related to color pie, but this seems to go out of the window when colorless artifacts and colorless hybrid are the subject.

See this and this.

As for the card... I like the 2 life for 2 damage thing. Flashback doesn't seem necessary at all and would need some good flavor to make sense with it. Giving all colors access to Scorching Spear / Hornet Sting is one thing (not a fan of that either), but Shock now as well? Ugh.

I'm pretty sure we just fundamentally disagree about how color pie works. I'm pretty sure my concept of it is a lot closer to that of Wizards (who has in fact, made very many colorless burn spells, (Staff of Nin, Scuttling Doom Engine, Aetherflux Reservoir, Triskelion, Walking Ballista, Meteorite, Sword of Fire and Ice, Sword of War and Peace). The reason that something like paying 2 colorless for a burn spell is okay, but paying 2U for one isn't, is because, if there are a bunch of blue burns spells, then a blue burn deck becomes somewhat reasonable, but colorless spells don't create this problem, because every time there is a colorless burn spell, red will have access to it (in addition to red burn spells), which means that this doesn't effect the fact that red is the best at burn.

Colorless cards don't make playing a deck around an idea that belongs to a particular color, without that color, ideal or reasonable in most cases.

Anyways, I do get you have your theories about how you think color pie should work, but I and Wizards disagree with them, so I don't think that evaluating cards I design based on your concept of color pie (which is neither the same as mine, or Wizards) is exactly useful criticism.