Then check out an Outlaws of Thunder Junction Commander Party
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
Normally, a deck cannot be built around countermagic, even in mono-blue, but creatures like Baral, Chief of Compliance change all that
Armageddon and Ravages of War are two examples that only destroy lands, but some wraths like Balance, Obliterate, and Worldfire hit pretty much everything
is focused almost entirely on dueling, and the lore has the term "duel" all over the place