The card pool for Commander is vast and includes many powerful and expensive spells
Legendary cards in Magic: The Gathering are powerfulthe Legendary sub-type means only one of them can exist on a side of the battlefield at a time, which generally means they're too powerful to have multiples in play
Creature Artifact - Thopter Color tag templates(None) Pathrazer of Ulamog Annihilator 3 (Whenever this creature attacks, defending player sacrifices three permanents of their choice.) This creature can't be blocked except by three or more creatures
Im a firm believer that playing against cards like these if youve never had to do it before makes you see lines of play youve never considered and in the long run, you as a player grow into someone who has a better understanding of the possibilities of your own deck
Some people like a challenge (its me, Im some people)
No death triggers, recursion, or Ill just bring it back next turn. Six mana is a lot, but the control you get in return is worth it