Most played cards in RUW Midrange:

1 Decks
Lightning Bolt
4 copies - 4 average
Disenchant
4 copies - 4 average
Mana Vault
4 copies - 4 average
Plateau
4 copies - 4 average
Rukh Egg
4 copies - 4 average
Shivan Dragon
4 copies - 4 average
Blue Elemental Blast
3 copies - 3 average
Divine Offering
3 copies - 3 average
City of Brass
3 copies - 3 average
Volcanic Island
3 copies - 3 average
Red Elemental Blast
3 copies - 3 average
Icy Manipulator
3 copies - 3 average
Orgg
3 copies - 3 average
Wrath of God
3 copies - 3 average
Balance
2 copies - 2 average
Fork
2 copies - 2 average
Blood Moon
2 copies - 2 average
Sol Ring
2 copies - 2 average
Tundra
2 copies - 2 average
Fireball
2 copies - 2 average