Design Articles by Wizards

DESIGN:

Design 101:
http://magic.wizards.com/en/articles/archive/making-magic/design-101-2003-04-21

Design 102:
http://magic.wizards.com/en/articles/archive/making-magic/design-102-2004-07-12

Design 103:
http://magic.wizards.com/en/articles/archive/making-magic/design-103-2006-11-06

Design 104:
http://magic.wizards.com/en/articles/archive/making-magic/design-104-2013-08-16
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NUTS AND BOLTS:

Card Codes:
http://magic.wizards.com/en/articles/archive/making-magic/nuts-bolts-card-codes-2009-01-12

Design Skeleton:
http://magic.wizards.com/en/articles/archive/making-magic/nuts-bolts-design-skeleton-2010-02-15

Filling in the Design Skeleton:
http://magic.wizards.com/en/articles/archive/making-magic/nuts-bolts-filling-design-skeleton-2011-02-28

Higher Rarities:
http://magic.wizards.com/en/articles/archive/making-magic/nuts-and-bolts-higher-rarities-2012-02-23

Initial Playtesting:
http://magic.wizards.com/en/articles/archive/making-magic/nuts-bolts-initial-playtesting-2013-02-11

Iteration:
http://magic.wizards.com/en/articles/archive/making-magic/nuts-bolts-iteration-2014-03-03

The Three Stages of Design:
http://magic.wizards.com/en/articles/archive/making-magic/nuts-bolts-three-stages-design-2015-03-30

Troubleshooting:
http://magic.wizards.com/en/articles/archive/making-magic/nuts-bolts-troubleshooting-2016-02-15

Evaluation:
https://magic.wizards.com/en/articles/archive/making-magic/nuts-bolts-evaluation-2017-02-20

Creative Elements:
https://magic.wizards.com/en/articles/archive/making-magic/nuts-bolts-10-creative-elements-2018-03-26

Art:
https://magic.wizards.com/en/articles/archive/making-magic/nuts-bolts-art-2019-02-11