Most played cards in Mono Black Aggro:

1 Decks
Snow-Covered Swamp
5 copies - 5 average
Opposition Agent
4 copies - 4 average
Rotting Regisaur
4 copies - 4 average
Hymn to Tourach
4 copies - 4 average
Leyline of the Void
4 copies - 4 average
Thoughtseize
4 copies - 4 average
Dark Confidant
4 copies - 4 average
Dark Ritual
4 copies - 4 average
Wasteland
4 copies - 4 average
Castle Locthwain
3 copies - 3 average
Chrome Mox
3 copies - 3 average
Liliana of the Veil
3 copies - 3 average
Plague Engineer
3 copies - 3 average
Liliana's Triumph
3 copies - 3 average
Eliminate
2 copies - 2 average
Pithing Needle
2 copies - 2 average
Bloodchief's Thirst
2 copies - 2 average
Null Rod
2 copies - 2 average
Grafdigger's Cage
2 copies - 2 average
Fatal Push
2 copies - 2 average