(Today's list will only have one card.) Best as a Commander - This category covers, as advertised, the best commander to lead a deck in Commander, but may also look briefly at other Command Zone-driven formats
It's hard to setup these perfect board states when, y'know, your opponent is also playing the game
Its fantastic in decks that care about lands, turning basics into combo pieces or value lands, or helping to fill your graveyard for cards like The Gitrog Monster or Titania, Protector of Argoth
Of course, this means you need a character on board that can initiate the challenge before Maid Marian gets value, but there are 11 4-cost characters that all have decent Strength values, so it isn't hard to get something down the previous turn that can take the Challenge
The threat of it doing so does make your opponent more likely to trade with it though