I can't believe nobody said Library of Alexandria.
That thing is a card-drawing MACHINE.
It's not a creature...there goes one class of permanent removal.
It's not a spell, so you can't counter it.
It's not an artifact or enchantment, so there go two more classes of permanent removal.
Having played years of Type 1, I've found one universal fact to be true when playing against Library of Alexandria: destroy it, or it will destroy you.