Card pairs, in Magic: The Gathering, are any two cards that are more often than not featured in the same set and share a number of characteristics, such as card names, mana costs, rarities, card types (and, if applicable, creature subtypes and powers/toughnesses), and abilities or effects. Pairs of cards may be mirrored pairs or matched pairs.
A matched pair (or parallel pair) is a pair of cards that are of the same color and the abilities refer to another enemy color (or an allied color or another allied color). Examples of matched pairs include Disciple of Grace and Disciple of Law as well as Aven Smokeweaver and Treetop Sentinel.
A mirrored pair is a pair of cards that are of different colors, often being of enemy colors and featuring color-based abilities that are inverted in the other card of the mirrored pairing. Examples of mirrored pairs include White Knight and Black Knight, which is amongst the most iconic mirrored pairs in Magic; Holy Strength and Unholy Strength; Blue Elemental Blast and Red Elemental Blast; and timeshifted cards of Planar Chaos and the original cards to which they pay homage.
- Jay Moldenhauer-Salazar (November 28, 2002). "Picking the Pieces". magicthegathering.com. Wizards of the Coast.
- Aaron Forsythe (May 8, 2006). "Dissension Design Documented". magicthegathering.com. Wizards of the Coast.
- Zac Hill (July 6, 2012). "The Cards of Magic 2013, Part 1". magicthegathering.com. Wizards of the Coast.
- Mike Flores (July 6, 2006). "White Hat Versus Oiled Mustache, Round Thirteen". magicthegathering.com. Wizards of the Coast.
- Mark Rosewater (September 04, 2017). "Are "opposite" cards like Knight of Glory/Knight of Infamy still a thing?". Blogatog. Tumblr.