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Every color gets cantrips, but unconditionally drawing two cards is a break in both colors, let alone three

Hmm. I disagree; I think. Green gets "Everyone draws a card and I get upside" sometimes; and white gets it very rarely. (It is vastly more often blue, of course; secondary red.)

There's Nature's Resurgence which is a bend, as it's draw based on creatures. But - Rites of Flourishing and Rousing of Souls which is outright card-draw-for-all in pure green and pure-white respectively. Pure-green also has Selvala's Charge and Selvala's Enforcer. It looks like parley is Selvala's signature ability; really. (And Selvala, Explorer Returned is white-green...). Truce shows a very white way to do this; while Shatter the Sky says white can even have it as a downside.

So colourwise? I think it can be allowed.

Admittedly - everyone gets TWO cards and your upside is a third card is way too strong for this cheap. But it seems like it's a viable pie bend. Especially with the very green "play an extra land".

Yeah, it's the drawing multiple cards that I'm saying is a break

Green can draw multiple cards, but usually needs a creature (potentially doing something) to do so, though Rites of Flourishing as Vitenka pointed out exists. Unconditional, multiple-card group draw on a sorcery is what feels more like a break for the colors. I also agree with Vitenka that the cost is way too cheap when you're drawing three cards. If this was somehow on an enchantment or creature, or at least tied to one of those card types, I think the effect would be fine. Right now, I'd say it's GU instead of WG.

I thought three mana was way too much for the card disadvantage, so I made it a cantrip Vision Skeins.

I'm trying out variants upon Happily Ever After bringing symmetric draw back into white. This means "unconditionally" does not apply since there is a condition: You must be willing to share.

I want to explore appropriate ways to get multiple cards at once in hand using that mechanical space. But I'm willing to iterate.