26 cards where the artist name includes “margaret organ-kean”

Amulet of Kroog (Masters Edition IV #179)
Autumn Willow (Masters Edition #113)
Balm of Restoration (Fallen Empires #82)
Broken Visage (Fifth Edition #149)
Cloak of Confusion (Masters Edition II #82)
Daughter of Autumn (Homelands #85)
Dwarven Pony (Homelands #70)
Dwarven Trader (Homelands #72a)
Essence Vortex (Ice Age #287)
Foxfire (Fifth Edition #295)
Freyalise's Charm (Ice Age #240)
Heart Wolf (Homelands #75)
Hipparion (Fifth Edition #34)
Implements of Sacrifice (Fallen Empires #88)
Ivory Tower (Masters Edition #158)
Lion's Eye Diamond (Mirage #307)
Mana Prism (Vintage Masters #273)
Martyrs of Korlis (Masters Edition IV #20)
Merseine (Fallen Empires #23b)
Sacred Mesa (Time Spiral Timeshifted #13)
Spectral Shield (Masters Edition III #176)
Spore Flower (Masters Edition II #177)
Tarpan (Fifth Edition #330)
Thelonite Druid (Masters Edition II #182)
Tranquility (Tempest Remastered #201)
Zebra Unicorn (Mirage #290)

This search is finished. Now the real work can begin.