If youre playing [c]Cancel[/c], which costs three mana, Id replace it with [c]Counterspell[/c], which costs two
Finally, if things start going really bad, just pull a Kefka and destroy the world using Ruinous Ultimatum. This card is incredibly high-cost but allows you to destroy all non-land permanents all your opponents control
Additional box purchases are available at slightly below market price while supplies last after the event
The playful take on Edvard Munch's The Scream, which can reach about $10,000
However, this only works with cards that create a trigger of some sort later in the turn
Later in the game, you can pay two black and two red, as well as exile five other cards from your graveyard, in order to bring Kroxa back onto the battlefield and force your opponent to discard again