Onderzeeboot
Ecstatic Orb
As you can gather from the previous replies, there isn't a wrong way to do it. I agree with Brad that, in the end, it's irrelevant where you put it. Players drafting your cube aren't going to notice how you classified your cards, unless you do something really wild like classifying your green cards as red and seeding your boosters (potentially leading to fewer red and green cards in boosters). In other words, go with your gut feeling.
As for me, I like to determine which color identity is most likely to pick up the card. Spring and Road aren't efficient enough to make the cut in a mono green deck, you want to be able to cast the backside to get full value out of the cards. That's why I, like Mown, would put them in the gold section.
As for me, I like to determine which color identity is most likely to pick up the card. Spring and Road aren't efficient enough to make the cut in a mono green deck, you want to be able to cast the backside to get full value out of the cards. That's why I, like Mown, would put them in the gold section.