Mana filters dont always add extra mana like ramp does, but they still produce mana, which means theyre considered mana sources under the rules
Examples include: vigilance, double strike, banding, and space sculptor
Black Star Promos and box or tournament cards often carry a PROMO mark instead of a standard rarity symbol
Based on those very loose maths, Id have to open another 14 or so booster boxes to get anywhere close to pulling all the special art
FromTheShire: When I said I wanted more new Goblins in MH3 this is not what I had in mind Wizards
Its been years since I last played a game where neither me nor my opponent put a counter of any kind on the board, so the ubiquity of proliferate commanders makes them eternally playable, and more often than not, fairly powerful