Most played cards in RW Midrange:

3 Decks
Plateau
12 copies - 4 average
Swords to Plowshares
11 copies - 3.67 average
Disenchant
10 copies - 3.33 average
Red Elemental Blast
10 copies - 3.33 average
Lightning Bolt
9 copies - 3 average
Shivan Dragon
9 copies - 3 average
Serra Angel
8 copies - 2.67 average
Maze of Ith
6 copies - 2 average
Mishra's Factory
6 copies - 2 average
Fellwar Stone
5 copies - 1.67 average
Fireball
5 copies - 1.67 average
Blood Moon
4 copies - 1.33 average
Rukh Egg
4 copies - 1.33 average
Wrath of God
4 copies - 1.33 average
Savannah
4 copies - 1.33 average
Dragon Whelp
4 copies - 1.33 average
Jayemdae Tome
4 copies - 1.33 average
Uthden Troll
4 copies - 1.33 average
Taiga
4 copies - 1.33 average
Divine Offering
4 copies - 1.33 average