Most played cards in Ninjas:

6 Decks
Force of Will
24 copies – 4 avg
Brainstorm
24 copies – 4 avg
Polluted Delta
24 copies – 4 avg
Prismatic Vista
24 copies – 4 avg
Ornithopter
24 copies – 4 avg
Changeling Outcast
23 copies – 3.83 avg
Retrofitter Foundry
22 copies – 3.67 avg
Ponder
21 copies – 3.5 avg
Ingenious Infiltrator
20 copies – 3.33 avg
Yuriko, the Tiger's Shadow
19 copies – 3.17 avg
Plague Engineer
15 copies – 2.5 avg
Daze
14 copies – 2.33 avg
Back to Basics
12 copies – 2 avg
Snuff Out
10 copies – 1.67 avg
Baleful Strix
9 copies – 1.5 avg
Moon-Circuit Hacker
9 copies – 1.5 avg
Surgical Extraction
9 copies – 1.5 avg
Brazen Borrower
9 copies – 1.5 avg
Underground Sea
8 copies – 1.33 avg
Leyline of the Void
8 copies – 1.33 avg