The Moxen and Black Lotus, lands like Tolarian Academy, the Affinity mechanic, Stoneforge Mystic, Aetherworks Marvel all of these circumvent the traditional flow of a game and allow you to rocket, if not outright jump, straight to the finish line of your decks game plan
With Zulaport Cutthroat, Blood Artist, or Syr Konrad, the Grim, this is a win condition
I feel that, in general, Think Twice is overplayed
The financial scale for the legendary Illustrator Pikachu demonstrates the full potential of card collecting, shattering every record known to tabletop history
This enchantment subtype can create powerful interactions and there will be plenty more auras to come in the future sets of MTG