Most played cards in Turbo Land:

3 Decks
Crucible of Worlds
9 copies - 3 average
Gush
8 copies - 2.67 average
Leyline of the Void
8 copies - 2.67 average
Intuition
8 copies - 2.67 average
Mana Drain
8 copies - 2.67 average
Force of Will
8 copies - 2.67 average
Merchant Scroll
8 copies - 2.67 average
Accumulated Knowledge
8 copies - 2.67 average
Brainstorm
8 copies - 2.67 average
Flooded Strand
6 copies - 2 average
Argivian Find
5 copies - 1.67 average
Oboro, Palace in the Clouds
4 copies - 1.33 average
Red Elemental Blast
4 copies - 1.33 average
Horn of Greed
4 copies - 1.33 average
Tropical Island
4 copies - 1.33 average
Polluted Delta
4 copies - 1.33 average
Oxidize
4 copies - 1.33 average
Ancient Tomb
4 copies - 1.33 average
Duress
4 copies - 1.33 average
Misdirection
4 copies - 1.33 average