Most played cards in Jori En, Ruin Diver:

2 Decks
Snow-Covered Mountain
6 copies - 3 average
Snow-Covered Island
6 copies - 3 average
Arid Mesa
2 copies - 1 average
Harsh Mentor
2 copies - 1 average
Opt
2 copies - 1 average
Grim Lavamancer
2 copies - 1 average
Goblin Rabblemaster
2 copies - 1 average
Delver of Secrets
2 copies - 1 average
Earthshaker Khenra
2 copies - 1 average
Firebrand Archer
2 copies - 1 average
Char
2 copies - 1 average
Abrade
2 copies - 1 average
Brainstorm
2 copies - 1 average
Stormchaser Mage
2 copies - 1 average
True-Name Nemesis
2 copies - 1 average
Soul-Scar Mage
2 copies - 1 average
Snapcaster Mage
2 copies - 1 average
Monastery Swiftspear
2 copies - 1 average
Vapor Snag
2 copies - 1 average
Young Pyromancer
2 copies - 1 average