Wish

A Wish is an effect that brings one or more cards "you own from outside the game" into your hand. In a casual game, a card you choose from outside the game comes from your personal collection. In a tournament event, a card you choose from outside the game must come from your sideboard.

Printings
Wishes got their name from a cycle of cards in Judgment: Golden Wish, Cunning Wish , Death Wish , Burning Wish , Living Wish.

Following the original cycle, several wishes have been printed:


 * Coax from the Blind Eternities  Eldrazi related
 * Collector Protector  silver-bordered
 * Frontier Explorer  a test card that specifically targets Plains.
 * Glittering Wish</c>  shares naming with the original cycle
 * Granted</c>
 * Karn, the Great Creator</c>  has a wish effect as his  loyalty ability.
 * Mastermind's Acquisition</c>  is a modal spell; the alternate mode is a tutor effect
 * Research</c>
 * Ring of Ma'rûf</c>  printed before the original wishes
 * Spawnsire of Ulamog</c>  Eldrazi related
 * Spike, Tournament Grinder</c>  silver-bordered
 * The Raven's Warning</c>  Chapter  is a wish effect
 * Vivien, Arkbow Ranger</c>  has a wish effect as her  loyalty ability.
 * Wizened Arbiter</c>  a test card that specifically targets white cards.

The wish effects of Coax from the Blind Eternities</c> and Karn, the Great Creator</c> can also be used to bring back a card from exile instead of bringing in a card from outside the game.

Wishboard
A wishboard is a sideboard for a deck that is intended to be used in conjunction with wishes. Often, these sideboard cards are not intended to ever be sided into the main deck between games; rather, one of the wishes is used to retrieve the cards instead. The intent of this strategy is to not devote main deck space to cards that may be irrelevant in any particular match-up. Instead, one trades game tempo for the ability to have the correct answer every game. This is, of course, assuming that the wishboard contains the proper answers.