Most played cards in Turbo Grinding:

2 Decks
Shelldock Isle
8 copies - 4 average
Time Warp
8 copies - 4 average
Twincast
8 copies - 4 average
Wall of Frost
8 copies - 4 average
Flashfreeze
8 copies - 4 average
Plumeveil
8 copies - 4 average
Sanity Grinding
8 copies - 4 average
Dream Fracture
8 copies - 4 average
Jace Beleren
8 copies - 4 average
Cryptic Command
8 copies - 4 average
Broken Ambitions
7 copies - 3.5 average
Negate
4 copies - 2 average
Sleep
4 copies - 2 average
4 copies - 2 average
Howling Mine
4 copies - 2 average
Oona, Queen of the Fae
3 copies - 1.5 average
Vendilion Clique
3 copies - 1.5 average
Sower of Temptation
3 copies - 1.5 average
Reliquary Tower
1 copies - 0.5 average
Traumatize
1 copies - 0.5 average