Most played cards in W/B Allies:

1 Decks
Bone Splinters
4 copies - 4 average
Cliffhaven Vampire
4 copies - 4 average
Drana's Emissary
4 copies - 4 average
Ally Encampment
4 copies - 4 average
Caves of Koilos
4 copies - 4 average
Zulaport Cutthroat
4 copies - 4 average
Expedition Envoy
4 copies - 4 average
Serene Steward
4 copies - 4 average
Kalastria Healer
4 copies - 4 average
Campaign of Vengeance
3 copies - 3 average
Captain's Claws
3 copies - 3 average
March from the Tomb
3 copies - 3 average
Lantern Scout
3 copies - 3 average
Read the Bones
2 copies - 2 average
Declaration in Stone
2 copies - 2 average
Cliffside Lookout
2 copies - 2 average
Drana, Liberator of Malakir
2 copies - 2 average
Gideon, Ally of Zendikar
2 copies - 2 average
Shambling Vent
2 copies - 2 average
Stasis Snare
2 copies - 2 average