Most played cards in :

8 Decks
Fabled Passage
32 copies - 4 average
Uro, Titan of Nature's Wrath
32 copies - 4 average
Aether Gust
29 copies - 3.63 average
Breeding Pool
29 copies - 3.63 average
Shark Typhoon
22 copies - 2.75 average
Overgrown Tomb
22 copies - 2.75 average
Nissa, Who Shakes the World
21 copies - 2.63 average
Thought Erasure
20 copies - 2.5 average
Zagoth Triome
20 copies - 2.5 average
Mystical Dispute
20 copies - 2.5 average
Eliminate
19 copies - 2.38 average
Negate
18 copies - 2.25 average
Watery Grave
17 copies - 2.13 average
Extinction Event
16 copies - 2 average
Heartless Act
16 copies - 2 average
Hydroid Krasis
14 copies - 1.75 average
Enter the God-Eternals
13 copies - 1.63 average
Opt
12 copies - 1.5 average
Narset, Parter of Veils
11 copies - 1.38 average
Ketria Triome
11 copies - 1.38 average