Most played cards in Superfriends:

1 Decks
Oath of Nissa
4 copies – 4 avg
Leyline of the Void
4 copies – 4 avg
Mindbreak Trap
4 copies – 4 avg
Interplanar Beacon
4 copies – 4 avg
Karn, the Great Creator
3 copies – 3 avg
Humility
3 copies – 3 avg
City of Brass
3 copies – 3 avg
Teferi, Time Raveler
3 copies – 3 avg
Liliana, the Last Hope
3 copies – 3 avg
Narset, Parter of Veils
3 copies – 3 avg
Swords to Plowshares
3 copies – 3 avg
Ancient Tomb
3 copies – 3 avg
Toxic Deluge
2 copies – 2 avg
Verdant Catacombs
2 copies – 2 avg
Ashiok, Dream Render
2 copies – 2 avg
Marsh Flats
2 copies – 2 avg
Grist, the Hunger Tide
2 copies – 2 avg
Kaya, Orzhov Usurper
2 copies – 2 avg
Sevinne's Reclamation
2 copies – 2 avg
Assassin's Trophy
2 copies – 2 avg