The red of Mufasa's mane pops out against the Sapphire Ink blue used to color the magic that swirls around him and the sky behind
#7: White Suns Twilight This is the big question mark card of the Top 10 list
I also think this has enhanced value in Simic Ramp decks where you draw ramp spells like Rampant Growth or Cultivate after your mana is set
Then, if that wasnt enough, this legendary inflicts one damage to each opponent for every zombie under your control at the start of tour upkeep, and gives you scry for each zombie too
Circle of Protection: White seems rather weak against a color designed to destroy enchantments, and many blue decks can take complete control of the game before leisurely bouncing a Circle of Protection: Blue (assuming they aren't just decking you to begin with)
However, black mana received new importance in Magic's Vintage format with the release of Tales of Middle-earth and perhaps the most disruptive card Vintage has seen in years: Orcish Bowmasters