Most played cards in Planeswalkers Control:

4 Decks
Force of Will
16 copies - 4 average
Pyroblast
13 copies - 3.25 average
Wrenn and Six
13 copies - 3.25 average
Force of Vigor
12 copies - 3 average
Tropical Island
12 copies - 3 average
Deathrite Shaman
12 copies - 3 average
Dack Fayden
12 copies - 3 average
Leyline of the Void
12 copies - 3 average
Wasteland
11 copies - 2.75 average
Oko, Thief of Crowns
9 copies - 2.25 average
Misty Rainforest
9 copies - 2.25 average
Lightning Bolt
9 copies - 2.25 average
Force of Negation
9 copies - 2.25 average
Volcanic Island
9 copies - 2.25 average
Preordain
8 copies - 2 average
Scalding Tarn
8 copies - 2 average
Flusterstorm
8 copies - 2 average
Flooded Strand
8 copies - 2 average
Polluted Delta
7 copies - 1.75 average
Uro, Titan of Nature's Wrath
5 copies - 1.25 average