Most played cards in UWR Control:

2 Decks
Snapcaster Mage
8 copies - 4 average
Flooded Strand
8 copies - 4 average
Serum Visions
7 copies - 3.5 average
Lightning Bolt
7 copies - 3.5 average
Scalding Tarn
7 copies - 3.5 average
Path to Exile
7 copies - 3.5 average
Celestial Colonnade
6 copies - 3 average
Cryptic Command
6 copies - 3 average
Lightning Helix
6 copies - 3 average
Hallowed Fountain
4 copies - 2 average
Steam Vents
4 copies - 2 average
Stony Silence
3 copies - 1.5 average
Search for Azcanta
3 copies - 1.5 average
Monastery Mentor
3 copies - 1.5 average
Jace, the Mind Sculptor
3 copies - 1.5 average
Spell Queller
3 copies - 1.5 average
Wear // Tear
3 copies - 1.5 average
Supreme Verdict
3 copies - 1.5 average
Logic Knot
3 copies - 1.5 average
Electrolyze
3 copies - 1.5 average