Morph, as executed in Khans of Tarkir , was a really fun mechanic for Limited play
This black market would have spawned even if trading had been released with absolutely no restrictions, however
English cards are notably more random when it comes to print quality
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Toolbox Buy This Card Notes and Rules Information for Soul Shatter: As Soul Shatter resolves, first the opponent whose turn it is (or the next opponent in turn order, if it's your turn) chooses a creature or planeswalker they control with the highest mana value among that player's creatures and planeswalkers, then each other opponent in turn order does the same, knowing the choices made before them
For better or worse, this set will only be available at MagicCons, via Festival in a Box, and at Gen Con