The full list of all these variants by price can be found below, from most to least expensive
Anyways, read my article about how Aggro is Really Good in Commander Right Now
The difference between Brawl and Commander is that Brawl is a oneonone format with a 25life starting total and a smaller card pool, while Commander is a fourplayer format starting at 40 life with access to all Magic cards and unique rules like commander damage
Runner-Up : Frames as a design tool Unglued introduced several things to Magic , including tokens and full-art lands, but the most important aspect I believe happened in a card called B.F.M
When Enduring Curiosity dies, if it was a creature, return it to the battlefield under its owner's control
This is taken from the 1001 Nights story of the Persian King Kosrouschah, although in that story it's the leaves of the Singing Tree that has mouths