Most played cards in Counterbalance:

5 Decks
Snow-Covered Island
35 copies - 7 average
Hinder
20 copies - 4 average
Remand
18 copies - 3.6 average
Sensei's Divining Top
17 copies - 3.4 average
Counterbalance
14 copies - 2.8 average
Court Hussar
13 copies - 2.6 average
Condemn
13 copies - 2.6 average
Meloku the Clouded Mirror
12 copies - 2.4 average
Spell Snare
12 copies - 2.4 average
Underground River
12 copies - 2.4 average
Dark Confidant
12 copies - 2.4 average
Hallowed Fountain
12 copies - 2.4 average
Last Gasp
11 copies - 2.2 average
Threads of Disloyalty
10 copies - 2 average
Godless Shrine
9 copies - 1.8 average
Scrying Sheets
9 copies - 1.8 average
Orzhov Pontiff
8 copies - 1.6 average
Muddle the Mixture
8 copies - 1.6 average
Phyrexian Ironfoot
8 copies - 1.6 average
Umezawa's Jitte
7 copies - 1.4 average