Most played cards in Ninjas:

2 Decks
Mana Leak
8 copies - 4 average
Plow Under
8 copies - 4 average
Sakura-Tribe Elder
8 copies - 4 average
Troll Ascetic
8 copies - 4 average
Sword of Fire and Ice
8 copies - 4 average
Iwamori of the Open Fist
8 copies - 4 average
Ninja of the Deep Hours
8 copies - 4 average
Eternal Witness
8 copies - 4 average
Birds of Paradise
8 copies - 4 average
Vedalken Shackles
6 copies - 3 average
Chrome Mox
6 copies - 3 average
Echoing Truth
6 copies - 3 average
Squelch
4 copies - 2 average
Naturalize
4 copies - 2 average
Bribery
4 copies - 2 average
Condescend
4 copies - 2 average
Viridian Shaman
4 copies - 2 average
3 copies - 1.5 average
Okina, Temple to the Grandfathers
2 copies - 1 average