Most played cards in The Shining:

5 Decks
Mana Drain
20 copies - 4 average
Accumulated Knowledge
20 copies - 4 average
Brainstorm
20 copies - 4 average
Force of Will
20 copies - 4 average
Flooded Strand
17 copies - 3.4 average
Underground Sea
15 copies - 3 average
Polluted Delta
12 copies - 2.4 average
Duress
11 copies - 2.2 average
Future Sight
10 copies - 2 average
Tropical Island
10 copies - 2 average
Intuition
9 copies - 1.8 average
Cunning Wish
9 copies - 1.8 average
Burning Wish
8 copies - 1.6 average
Volcanic Island
6 copies - 1.2 average
Psychatog
6 copies - 1.2 average
Hurkyl's Recall
6 copies - 1.2 average
Sol Ring
5 copies - 1 average
Tolarian Academy
5 copies - 1 average
Time Walk
5 copies - 1 average
Misdirection
5 copies - 1 average