Most played cards in Mono Blakc:

1 Decks
Cryptbreaker
4 copies - 4 average
Liliana's Mastery
4 copies - 4 average
Dark Salvation
4 copies - 4 average
Scrapheap Scrounger
4 copies - 4 average
Lord of the Accursed
4 copies - 4 average
Metallic Mimic
4 copies - 4 average
Relentless Dead
4 copies - 4 average
Liliana, the Last Hope
4 copies - 4 average
Diregraf Colossus
4 copies - 4 average
Dread Wanderer
4 copies - 4 average
Transgress the Mind
3 copies - 3 average
Fatal Push
3 copies - 3 average
Grasp of Darkness
3 copies - 3 average
Gonti, Lord of Luxury
2 copies - 2 average
Westvale Abbey
2 copies - 2 average