Thassa's Oracle I bet designers never imagined Thassa's Oracle would be used the way it is now as a cEDH win condition

Main Set Irohs Demonstration Source | Raven Eagle Source Earth Kingdom Protectors Source | Professor Zei, Anthropologist Source Bommerang Basics Source | The Boulder, Ready to Rumble Source Cruel Administrator Source | Fire Navy Trebuchet Source Avatar Destiny Source | Bumi, King of Three Trials Source Earth Kingdom Jailer Source | The Earth King Source Fire Nation Palace Source | Jasmine Dragon Tea Shop Source Destined Confrontation Source | Earthbender Ascension Source Combustion Man Source | Combustion Technique Source Ember Island Production Source | Fatal Fissure Source Fire Nation Raider Source | Sandbenders Storm Source Jumpstart Commander Bundle Booster Fun Scene Box Appa, the Vigilant Source | Earthshape Source Fire Nation Turret Source | Kataras Reversal Source Sokkas Charge Source | Swampbender Source Magic: The Gathering | Avatar: The Last Airbender is scheduled to release on November 21

it's definitely worth mentioning that Liliana, the Last Hope's +1 ability combines nicely with Grasp of Darkness to kill cards like Ishkanah, Grafwidow or Mindwrack Demon
Commander Decks The four Commander Decks for The Lord of the Rings: Tales of Middle-earth add even more characters and flavor to the experience
Wanna rip all the auras off a voltron commander
When you consider the recent track record of Teferi cards (and Planeswalkers in general), you can understand why the reaction to M21 being promoted as Core Set: Teferi was one of concern