Exchange of Words FromTheShire: Cheap, and there's a ton of text boxes you are going to want to steal, whether it's some nasty Annihilating Eldrazi or simply someone's Commander that you really think should have the text of a Saproling instead of whatever nonsense it was doing a second ago
Cori-Steel Cutter shines brightest in decks with a high density of cheap noncreature spells
In the card illustration, this fierce nature is clearly hinted at as Aerodactyl soars through the air, seemingly ready to attack anything that dares to challenge it
To stop them from achieving this, you need to save your counterspells for their most valuable cards (such as planeswalkers), even if that means letting less valuable cards resolve, such as smaller creatures
Four Mastery of the Unseen seems like a lot, but you have to understand that having multiples in play is actually quite good at a certain point