Most played cards in UWR control:

1 Decks
Solitude
4 copies - 4 average
Blood Sun
4 copies - 4 average
Teferi, Hero of Dominaria
4 copies - 4 average
Valakut Awakening
4 copies - 4 average
Wear // Tear
4 copies - 4 average
Force of Negation
4 copies - 4 average
Memory Deluge
4 copies - 4 average
Prismatic Ending
4 copies - 4 average
Cryptic Command
4 copies - 4 average
Fury
4 copies - 4 average
Flagstones of Trokair
4 copies - 4 average
Chalice of the Void
4 copies - 4 average
Lotus Field
4 copies - 4 average
March of Otherworldly Light
3 copies - 3 average
Rest in Peace
3 copies - 3 average
Spirebluff Canal
3 copies - 3 average
Steam Vents
2 copies - 2 average
Raugrin Triome
2 copies - 2 average
Seachrome Coast
2 copies - 2 average
Nexus of Fate
1 copies - 1 average