In Magic, there's a style of deck known as "aggro-control", which plays a mixture of cheap threats and disruption (especially counterspells). Against a pure control deck, aggro-control seeks to set up quickly in the early turns and then protect its board position from sweepers and spot removal using countermagic, long enough to get an opponent to 0 life.
From a control player's perspective, this can be a difficult situation because you're on a pretty fast clock, but your normal tricks against aggro decks (like Day of Judgment on turn 4) just don't work with any degree of consistency.
What are some strategies that you can employ, either during deckbuilding or in play, to improve a control deck's performance against aggro-control?