The design features Illustrations from manga, animation, and Illustrators new art
You can play these cards in all manner of formats, but particularly Modern and Commander, which are the two most popular
However, given that they don't seem like a mechanic exclusive to March of the Machine, but rather a type we'll see in Magic: The Gathering from now on, it's only a matter of time before cards come out that are good enough to be present in high-power level Metagames
You get a Treasure
Map tokens are not quite as strong as Treasure tokens, particularly in Commander, but I think they will still surprise plenty of people with how much they can impact a game
You must play the chosen card, if able and while playing the chosen card, you can use lands mana abilities from the opponent you are controlling to activate other lands mana ability or to use mana to play the chosen card