Obligatory shitty card creation thread

[Bed Decks Palyer]

Shouldn't these be formatted as +1, -2, -7?

Depends. The colored ones might be -2, +1, -6, right? Because they cost one mana more than Karn and thus you cannot play both them and yet another card on turn1.
But yeah, it's mostly because of the original Autumn Willow's manacost.