What's the white part here? First strike? That's obviously covered by red's pie. Low mana value of exiled stuff? It's not like red and/or blue couldn't do such an effect.

The thing is that white isn't that much into copying instant and sorceries in the first place and that's where the big focus of the card is.

Seems like an izzet card.

EDIT: I took a gander at the original design and by god that sure looks like a ""custom"" design lol. Like what sort of a cost is ? Why does it have double or the hybrid mana?

does there need to be anything white about it?

Would be nice so the colors aren't arbitrary. Having unnecessary colors can give wrong impressions about the nature of colors to less enfranchised players for example. The colors should be mechanically meaningful - that is after all is the beauty of the color pie.