Cards that you control that opponents can activate are great ways to sink their resources into things they dont need, or you can end them outright by activating an Aether Storm or Volrath's Dungeon over and over
Even among obvious contenders, classifying what sort of card earned its place on the Game-Changer List spotlights Commander's most important fundamentals (card advantage, resource denial, fast mana, etc.) while also directly listing what strategies, most often end up winning games
For one generic and one black mana , it allows you to search your library for any card, put that card into your hand, then shuffle your library
10 And They Shall Know No Fear Strength In Numbers Praise the Emperor, this card is so cool
This means that they're far less vulnerable to being raced by unfair combo than Tron