Most played cards in ATS:

5 Decks
Birds of Paradise
20 copies – 4 avg
Tropical Island
20 copies – 4 avg
Survival of the Fittest
20 copies – 4 avg
Tradewind Rider
19 copies – 3.8 avg
Brainstorm
16 copies – 3.2 avg
Force of Will
15 copies – 3 avg
Windswept Heath
13 copies – 2.6 avg
Savannah
13 copies – 2.6 avg
Wall of Roots
11 copies – 2.2 avg
Eternal Witness
10 copies – 2 avg
Taiga
9 copies – 1.8 avg
Quirion Ranger
9 copies – 1.8 avg
Enlightened Tutor
9 copies – 1.8 avg
Spike Feeder
8 copies – 1.6 avg
Naturalize
7 copies – 1.4 avg
Squee, Goblin Nabob
6 copies – 1.2 avg
Null Rod
6 copies – 1.2 avg
Flametongue Kavu
5 copies – 1 avg
Gilded Drake
5 copies – 1 avg
Wooded Foothills\n2 Arcane Laboratory
4 copies – 0.8 avg