By the way, I don't know if you noticed, but the modern Oracle wordings for the ten dual lands has what they tap for in reminder text, so they are, technically, according to the same wording as Urborg, Tomb of Yawgmoth, now fully colorless
They can be used to block almost any card, from creatures to sorceries to artifacts to planeswalkers, so long as you have them ready to catch those cards in the exact moment an opponent tries to play them
Hour of Devastation Foils Foils are mostly like uncommons, in the sense that their value doesn't change much from set to set
Having solid uncommons and commons helps even things out a bit, but even if you open way above average in terms of lower-rarity cards, it won't really make up for missing out on good mythics or foils because the good lower-rarity cards just aren't as valuable as the mythics and foils