Thraben Inspector gives us something we can play on Turn 1, and even though we have to sink some mana into cracking Clues, it does draw us a card eventually
(Those are supposed to be Bant sigils, but...) Flying Spaghetti Monster: Emrakul, the Aeons Torn, top contender for the largest and dumbest creature summonable
Ugin, the Ineffable Ugin, the Ineffable making Eldrazi cheaper amuses me since Ugin canonically opposed them and sealed them on Zendikar
Boromir, Warden of the Tower Often called the fun police, Boromir, Warden of the Tower shuts down commanders like Etali, Primal Conqueror or Narset, Enlightened Master by countering spells cast for free
Dubbed "White Lightning" (due to its newfound similarity to Ball Lightning), Waylay was issued quick errata that allowed it to be cast only during the combat phase