We grade fairly according to European standards (Cardmarket)
Rock on! But its not just your creatures that need to share a color
It's a solid inclusion in Dinosaur Tribal decks like Gishath, Sun's Avatar, it's an undercosted 7/7 so it's great in Ghalta, Primal Hunger, and it has a whopping 12 mana cost so it's great in CMC Matters decks that run stuff like Nissa's Revelation
Seal the Sleeve (or Top Loader) Seal your sleeve or top loader with tape, putting a slip of paper on top of the sleeve / top loader to prevent the tape from touching the cards
There are plenty of good options for this in Modern, but free counters like Force of Negation work best
Shadowless cards are visually identical to first edition copies, except they do not have an "Edition 1" stamp