Most played cards in Black Midrange:

3 Decks
Wasteland
12 copies – 4 avg
Dauthi Voidwalker
12 copies – 4 avg
Thoughtseize
12 copies – 4 avg
Dark Ritual
12 copies – 4 avg
Opposition Agent
9 copies – 3 avg
Hymn to Tourach
8 copies – 2.67 avg
Dark Confidant
8 copies – 2.67 avg
Plague Engineer
8 copies – 2.67 avg
Tourach, Dread Cantor
7 copies – 2.33 avg
Fatal Push
7 copies – 2.33 avg
Leyline of the Void
7 copies – 2.33 avg
Helm of Obedience
6 copies – 2 avg
Urborg, Tomb of Yawgmoth
5 copies – 1.67 avg
Grief
4 copies – 1.33 avg
Reanimate
4 copies – 1.33 avg
Orcish Bowmasters
4 copies – 1.33 avg
Stalactite Stalker
4 copies – 1.33 avg
Troll of Khazad-dûm
4 copies – 1.33 avg
Sheoldred's Edict
4 copies – 1.33 avg
Urza's Saga
3 copies – 1 avg