There aren't many colorless legendary spells you'll be casting anyway, and in this decklist, the only colorless legendary spells are artifacts, which aren't too costly to cast to begin with
I think this card frame looks best in foil since it foils the outside border area particularly well, and it also brings out the woodland forest behind the druid
Thats pretty pushed
Given that you'll already be dealing with your graveyard and sacrificing with black cards anyhow, it's not hard to get plenty of value out of Moonshadow's single mana cost, with menace being a little added insurance to make sure it doesn't get blocked too easily after you do
Its part best-of, featuring reprints of favorite cards from the last few years, and part bumper collection of some of the best art the game has ever seen
For a specific shiny full art like this Mew, you are realistically looking at well over a hundred packs on average to hit this exact one, which is why most master-set builders buy the slot as a single rather than waiting on the pull