
All fourteen cards appear in the Core Set; some of them (with asterixes, below) also appear in Magic 2015--Duels of the Planeswalkers.
The cards and their designers are below. Click any image for larger view:
Spirit Bonds -- Justin Gary
Wall of Essence -- Isaiah Cartwright
Chasm Skulker* -- Mike Neumann
Master of Predicaments -- David Sirlin
Cruel Sadist* -- Edmund McMillen
Ob Nixilis, Unshackled -- Brad Muir
Xathrid Slyblade* -- Rob Pardo
Aggressive Mining* -- Markus Persson
Goblin Kaboomist* -- Stone Librande
Genesis Hydra* -- George Fan
Yisan, the Wanderer Bard -- Brian Fargo
Avarice Amulet* -- Penny Arcade
Hot Soup* -- James Ernst
Shield of the Avatar -- Richard Garriott
Waste Not -- Magic community