Most played cards in The Rock:

4 Decks
Thragtusk
16 copies - 4 average
Overgrown Tomb
16 copies - 4 average
Woodland Cemetery
16 copies - 4 average
Desecration Demon
16 copies - 4 average
Mutilate
15 copies - 3.75 average
Lifebane Zombie
15 copies - 3.75 average
Liliana of the Veil
13 copies - 3.25 average
Scavenging Ooze
11 copies - 2.75 average
Duress
11 copies - 2.75 average
Sign in Blood
11 copies - 2.75 average
Tragic Slip
11 copies - 2.75 average
Mutavault
10 copies - 2.5 average
Underworld Connections
8 copies - 2 average
Disciple of Bolas
8 copies - 2 average
Putrefy
8 copies - 2 average
Doom Blade
8 copies - 2 average
Golgari Guildgate
8 copies - 2 average
Abrupt Decay
7 copies - 1.75 average
Vraska the Unseen
6 copies - 1.5 average
Devour Flesh
4 copies - 1 average