Most played cards in Mono Black Control:

3 Decks
Horobi's Whisper
12 copies - 4 average
Kokusho, the Evening Star
12 copies - 4 average
Psychic Spear
12 copies - 4 average
Hideous Laughter
12 copies - 4 average
Sickening Shoal
12 copies - 4 average
Cranial Extraction
12 copies - 4 average
Hero's Demise
12 copies - 4 average
Distress
12 copies - 4 average
Rend Flesh
11 copies - 3.67 average
Waking Nightmare
11 copies - 3.67 average
Yukora, the Prisoner
9 copies - 3 average
Nezumi Shortfang
8 copies - 2.67 average
Umezawa's Jitte
6 copies - 2 average
Genju of the Fens
5 copies - 1.67 average
Eradicate
3 copies - 1 average
Night of Souls' Betrayal
2 copies - 0.67 average
2 copies - 0.67 average
Ink-Eyes, Servant of Oni
1 copies - 0.33 average
Shizo, Death's Storehouse
1 copies - 0.33 average