While not a unique design in itself (each individual color got its own mana battery, and blue would later receive Iceberg in Ice Age ), this is a unique space for an Azorius card, and it has been efficient enough to allow Rasputin to see fringe play for years in Commander assuming you can find a copy
Pokemon fan discovers 20-year-old trading card pack under Target shelf You don't need to sail to remote desert islands in an effort to find valuable booty just head to your local superstore
Black If Blue was a tempo control color, then Black is the outright removal color in the One Piece Card Game
Im sure someone has Rule 0d these cards as their commanders somehow, which would be cool to see
Sword of Vengeance [Cat deck]: A great way to make one of your cats almost like Baneslayer Angel (Flying, first strike, lifelink, protection from Demons and from Dragons)