What this doesn't include: Cards that only recur one creature to the top of library or hand for more than 1 mana, unless it's a land
9 Giant Slug This card game has experimented with a lot of different mechanics and effects since the early days, and Wizards of the Coast really underestimated some effects (card draw, extra mana) while overestimating others
The gates were critical to the story of the RTR block, which focused on Jace Beleren as he tried to solve the mystery of the Implicit Maze, a construct of leylines weaving through Ravnica touching each of the 10 guildgates
Akhenaden, with the Millennium Spellbook, did just that, but he withheld one very important detail from his brother the pharaoh
Blood Moon is a three-drop that will convert all nonbasic lands into Mountains, essentially shutting down the complicated mana bases found in many multi-colored decks
The elimination of Trading Tokens is also well-awaited by the players as it makes the game easier and more flexible to play