Most played cards in Ninja:

1 Decks
Retrofitter Foundry
4 copies - 4 average
Ponder
4 copies - 4 average
Ornithopter
4 copies - 4 average
Prismatic Vista
4 copies - 4 average
Polluted Delta
4 copies - 4 average
Brainstorm
4 copies - 4 average
Force of Will
4 copies - 4 average
Baleful Strix
4 copies - 4 average
Force of Negation
3 copies - 3 average
Orcish Bowmasters
3 copies - 3 average
Yuriko, the Tiger's Shadow
3 copies - 3 average
Ingenious Infiltrator
3 copies - 3 average
Flusterstorm
2 copies - 2 average
Plague Engineer
2 copies - 2 average
Snuff Out
2 copies - 2 average
Back to Basics
2 copies - 2 average
Surgical Extraction
2 copies - 2 average
Sheoldred's Edict
2 copies - 2 average
Changeling Outcast
2 copies - 2 average
Murderous Cut
2 copies - 2 average