First Place Murktide Regent Andrea Piemonti This card was originally in my top 10 list, but not so high
Not only do you need to spend mana on casting equipment, but you also need a creature in play for the equipment to get any value
The Soul Stone Love it or hate it (probably the latter), Marvel's Spider-Man happened this year, and as much as we want to rail on the set, it actually delivered some goodies for Commander
One method that is surprisingly consistent is by poisoning your opponent until they lose the game
Book 1 is a 4-card scene, Book 2 is a 6-card scene, and Book 3 is a massive 9-card scene that's befitting of the series finale
Finally, the fact that the creature Self-Destruct targets actually sees it resolving is a big deal in current Standard