29 cards where the set is “m21” and the cards have a custom Showcase frame

Basri Ket (Core Set 2021 #286)
Basri's Acolyte (Core Set 2021 #287)
Basri's Lieutenant (Core Set 2021 #288)
Basri's Solidarity (Core Set 2021 #289)
Chandra, Heart of Fire (Core Set 2021 #301)
Chandra's Incinerator (Core Set 2021 #302)
Chandra's Magmutt (Core Set 2021 #303)
Chandra's Pyreling (Core Set 2021 #304)
Forest (Core Set 2021 #313)
Garruk's Gorehorn (Core Set 2021 #306)
Garruk's Harbinger (Core Set 2021 #307)
Garruk's Uprising (Core Set 2021 #308)
Garruk, Unleashed (Core Set 2021 #305)
Island (Core Set 2021 #310)
Liliana's Devotee (Core Set 2021 #298)
Liliana's Standard Bearer (Core Set 2021 #299)
Liliana's Steward (Core Set 2021 #300)
Liliana, Waker of the Dead (Core Set 2021 #297)
Mountain (Core Set 2021 #312)
Plains (Core Set 2021 #309)
Swamp (Core Set 2021 #311)
Teferi, Master of Time (Core Set 2021 #290)
Teferi, Master of Time (Core Set 2021 #291)
Teferi, Master of Time (Core Set 2021 #292)
Teferi, Master of Time (Core Set 2021 #293)
Teferi's Ageless Insight (Core Set 2021 #294)
Teferi's Protege (Core Set 2021 #295)
Teferi's Tutelage (Core Set 2021 #296)
Ugin, the Spirit Dragon (Core Set 2021 #285)

The orcs’ banner sends a clear message: “You've reached the end of this search.”