The Redemption Program is created by Wizards of the Coast to appease customers in case a major product flaw occurs. This program has been invoked seventh times:
Due to a sorting error in June 1994, prior to packaging, all uncommon Legends cards were divided into two groups. As a result, whole booster boxes were filled with duplicates of only one group of uncommon cards. In response, Wizards of the Coast published a list of all affected cards in The Duelist magazine issue #2 and offered to replace sent-in cards from one group with the same amount of cards from the other group, chosen by the customer. No more than two copies of a card could be sent in, and the offer was limited to 100 cards per person.
Caused by a printing error in October 1996, the Japanese Mirage set was missing the card Flood Plain. In its place an extra Crystal Vein was printed. Wizards of the Coast offered a replacement: For two sent-in Japanese Crystal Veins, the customer received one Japanese Crystal Vein and a Japanese Flood Plain. Additionally a Japanese Nalathni Dragon was added as a bonus card. The Nalathni Dragon also exists in English.
In a similar case in September 1999, the Spanish Mercadian Masques set was missing the card Eye of Ramos. In its place an additional Worry Beads card was printed. As a method of redemption, Wizards of the Coast offered to replace sent-in Spanish Worry Beads with Spanish Eye of Ramos cards.
Because of the high quantity of banned cards in the Standard tournament environment during the Tempest and Urza's Saga block area, in April 1998 Wizards of the Coast activated their Redemption Program for the fourth time. Customers could send in all banned rare cards of both expert level blocks, in specific Earthcraft, Dream Halls, Mind over Matter, Recurring Nightmare, Fluctuator, Time Spiral, Tolarian Academy, and Memory Jar, and received one booster pack of the same set the banned card originated from per card.
When the Legions Elvish Rage Preconstructed Deck was released in February 2003, in place of Taunting Elf was Snarling Undorak, which was rather unusual having a Beast card in an Elvish theme deck. Wizards of the Coast apologized about that and said that if you send Snarling Undorak with a receipt of the deck you bought, they would send you two free Taunting Elf.
After the Coldsnap Theme Decks arrived on the shelves in July 2006, the Kjeldoran Cunning deck did not have all three Brainstorm cards in their deck and instead had one Essence Flare (which is also printed in the Snowscape theme deck). Due to that issue, Wizards of the Coast allowed you to send in those cards with a receipt of the deck you bought and they will send you a coupon for a discount when they restocked that deck with the correct cards.
For Theros Beyond Death (January 2020), the Buy-a-Box promo included two cards—one foil Athreos, Shroud-Veiled, and one foil full-art "Nyx" Land, both packaged inside an opaque sleeve. Due to a production error, the lands in these packs were non-foil. A reprint with proper foil treatment took place, and the replacement lands were shipped after or around Prerelease.
Elvish Rage Preconstructed Deck from Legions
Kjeldoran Cunning Preconstructed Deck from Coldsnap
Theros Beyond Death Production Error, News
English Nalathni Dragon