Most played cards in 4c Control:

5 Decks
Hallowed Fountain
20 copies - 4 average
Teferi, Time Raveler
20 copies - 4 average
Watery Grave
20 copies - 4 average
Thought Erasure
18 copies - 3.6 average
Elspeth Conquers Death
15 copies - 3 average
Narset, Parter of Veils
14 copies - 2.8 average
Godless Shrine
14 copies - 2.8 average
Cry of the Carnarium
14 copies - 2.8 average
Duress
12 copies - 2.4 average
Extinction Event
12 copies - 2.4 average
Nicol Bolas, Dragon-God
12 copies - 2.4 average
Interplanar Beacon
12 copies - 2.4 average
Fabled Passage
10 copies - 2 average
Aether Gust
10 copies - 2 average
Atris, Oracle of Half-Truths
10 copies - 2 average
Temple of Deceit
9 copies - 1.8 average
Heartless Act
9 copies - 1.8 average
Oath of Kaya
9 copies - 1.8 average
Breeding Pool
8 copies - 1.6 average
Uro, Titan of Nature's Wrath
8 copies - 1.6 average