Gainsay is a clever blue uncommon instant "Magic: The Gathering" card from Wizards of the Coast's expert expansion set "Theros" that you'll want to include in the sideboard of every Standard deck you play that can cast it.
Gainsay - 1U
Counter target blue spell.
"You dryfolk must take the air for granted. You constantly insist on wasting it."
-Kenessos, priest of Thassa
Originally printed in "Planeshift," Gainsay is featured in the "Inspiring Heroics" event deck and a cheap and efficient way to help combat opposing blue decks. For the same cost as Negate Gainsay can deal with creatures too, allowing you to stop that troublesome Master of Waves or Prognostic Sphinx an opponent is casting. While Gainsay is still capable of thwarting your adversary's Dissolve or Sphinx's Revelation you'll be leaving yourself open to non-blue spells which could have a devastating impact on the board state. An unanswered Rescue from the Underworld, Anger of the Gods, or Hero's Downfall may be exactly what your rival needs in order to steal the game right from under your toes.
With the rotation of Standard thanks to "Theros," players will be shifting towards playing less colors. Although Gainsay can hit many of the previous block's gold cards like Prime Speaker Zeganna or Duskmantle Seer there's a risk you'll end up falling victim to a non-blue spell. The number of non-blue cards is something to strongly consider when selecting which cards to sideboard out of your deck in favor of Gainsay. If there's a significant commitment to other colors, you may want to leave your hard counters like Counterflux or Render Silent in your main deck.
How will you use Gainsay?
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