Most played cards in Doran Rock:

4 Decks
Murmuring Bosk
16 copies - 4 average
Noble Hierarch
15 copies - 3.75 average
Maelstrom Pulse
15 copies - 3.75 average
Wilt-Leaf Liege
15 copies - 3.75 average
Great Sable Stag
15 copies - 3.75 average
Doran, the Siege Tower
15 copies - 3.75 average
Path to Exile
12 copies - 3 average
Treefolk Harbinger
12 copies - 3 average
Thoughtseize
10 copies - 2.5 average
9 copies - 2.25 average
Infest
9 copies - 2.25 average
Sunpetal Grove
9 copies - 2.25 average
Wren's Run Vanquisher
8 copies - 2 average
Reflecting Pool
8 copies - 2 average
Twilight Mire
8 copies - 2 average
Gilt-Leaf Palace
8 copies - 2 average
Putrid Leech
8 copies - 2 average
Qasali Pridemage
8 copies - 2 average
Profane Command
7 copies - 1.75 average
Gaddock Teeg
7 copies - 1.75 average