24 cards where the set is “znr” and the cards have a custom Showcase frame

Canyon Jerboa (Zendikar Rising #290)
Fearless Fledgling (Zendikar Rising #291)
Felidar Retreat (Zendikar Rising #292)
Makindi Ox (Zendikar Rising #293)
Prowling Felidar (Zendikar Rising #294)
Ruin Crab (Zendikar Rising #295)
Skyclave Squid (Zendikar Rising #296)
Dreadwurm (Zendikar Rising #297)
Skyclave Shade (Zendikar Rising #298)
Akoum Hellhound (Zendikar Rising #299)
Moraug, Fury of Akoum (Zendikar Rising #300)
Skyclave Geopede (Zendikar Rising #301)
Spitfire Lagac (Zendikar Rising #302)
Valakut Exploration (Zendikar Rising #303)
Canopy Baloth (Zendikar Rising #304)
Kazandu Mammoth // Kazandu Valley (Zendikar Rising #305)
Kazandu Mammoth // Kazandu Valley (Zendikar Rising #305)
Kazandu Nectarpot (Zendikar Rising #306)
Lotus Cobra (Zendikar Rising #307)
Scute Swarm (Zendikar Rising #308)
Skyclave Pick-Axe (Zendikar Rising #309)
Territorial Scythecat (Zendikar Rising #310)
Brushfire Elemental (Zendikar Rising #311)
Omnath, Locus of Creation (Zendikar Rising #312)
Phylath, World Sculptor (Zendikar Rising #313)

The message was clear to Sorin—time to search for something else.