Most played cards in Gro-a-tog:

3 Decks
Force of Will
12 copies - 4 average
Brainstorm
12 copies - 4 average
Polluted Delta
12 copies - 4 average
Flooded Strand
12 copies - 4 average
Underground Sea
11 copies - 3.67 average
Duress
9 copies - 3 average
Merchant Scroll
9 copies - 3 average
Stifle
8 copies - 2.67 average
Hurkyl's Recall
8 copies - 2.67 average
Quirion Dryad
8 copies - 2.67 average
Cunning Wish
8 copies - 2.67 average
Misdirection
6 copies - 2 average
Tropical Island
6 copies - 2 average
Skeletal Scrying
5 copies - 1.67 average
Mana Drain
5 copies - 1.67 average
Psychatog
5 copies - 1.67 average
Phyrexian Dreadnought
4 copies - 1.33 average
Blue Elemental Blast
3 copies - 1 average
Impulse
3 copies - 1 average
Demonic Tutor
3 copies - 1 average