13 cards where the set is “grn” and the cards are exclusive Planeswalker Deck cards

Plains (Guilds of Ravnica #260)
Island (Guilds of Ravnica #261)
Swamp (Guilds of Ravnica #262)
Mountain (Guilds of Ravnica #263)
Forest (Guilds of Ravnica #264)
Ral, Caller of Storms (Guilds of Ravnica #265)
Ral's Dispersal (Guilds of Ravnica #266)
Precision Bolt (Guilds of Ravnica #267)
Ral's Staticaster (Guilds of Ravnica #268)
Vraska, Regal Gorgon (Guilds of Ravnica #269)
Kraul Raider (Guilds of Ravnica #270)
Attendant of Vraska (Guilds of Ravnica #271)
Vraska's Stoneglare (Guilds of Ravnica #272)

It is the moment of discovery, the triumph of the mind, and the end of these results.