Normally, a deck cannot be built around countermagic, even in mono-blue, but creatures like Baral, Chief of Compliance change all that
Sam had built his deck by trading with kids in our neighborhood
Armageddon and Ravages of War are two examples that only destroy lands, but some wraths like Balance, Obliterate, and Worldfire hit pretty much everything
Overall I think Metallic Mimic will be a solid role-player for multiple Standard decks, allowing it to earn this spot on the list
Sacrifice after III.) I This Saga gains ": Add ." II This Saga gains ", : Create a 0/0 colorless Construct artifact creature token with 'This token gets +1/+1 for each artifact you control.'" III Search your library for an artifact card with mana cost or , put it onto the battlefield, then shuffle