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That flexibility is the whole game

As many of the things I was predicting mechanically, I didn't know where or how we would use it, I just recognized it was a tool we'd probably need one day

I also do think that objectively speaking, there is one card it looses the winner spot to right now

A spell or ability that counters spells can still target spells that can't be countered

In addition, Library of Leng gave you the option of putting cards you discarded (due to some effect like Mind Rot or Malfegor) on the top of your library rather than letting them be sent to your graveyard

a This card is removed from the top of his Deck to the Graveyard to activate "Remove Bomb" in episode 164