Most played cards in RW Control:

4 Decks
Arc Trail
16 copies - 4 average
Galvanic Blast
16 copies - 4 average
Shatter
16 copies - 4 average
Dispense Justice
16 copies - 4 average
Revoke Existence
16 copies - 4 average
Wurmcoil Engine
16 copies - 4 average
Arrest
14 copies - 3.5 average
Oxidda Scrapmelter
13 copies - 3.25 average
Contagion Clasp
13 copies - 3.25 average
Darksteel Myr
12 copies - 3 average
Trigon of Mending
12 copies - 3 average
Sunblast Angel
12 copies - 3 average
Ratchet Bomb
12 copies - 3 average
Molten-Tail Masticore
8 copies - 2 average
Elspeth Tirel
7 copies - 1.75 average
Kuldotha Phoenix
3 copies - 0.75 average
Mimic Vat
2 copies - 0.5 average