Most played cards in W/U Spirits:

1 Decks
Topplegeist
4 copies - 4 average
Spell Queller
4 copies - 4 average
Prairie Stream
4 copies - 4 average
Port Town
4 copies - 4 average
Rattlechains
4 copies - 4 average
Mausoleum Wanderer
4 copies - 4 average
Declaration in Stone
3 copies - 3 average
Stratus Dancer
3 copies - 3 average
Always Watching
3 copies - 3 average
Knight of the White Orchid
2 copies - 2 average
Dragonlord Ojutai
2 copies - 2 average
Blessed Alliance
2 copies - 2 average
Summary Dismissal
2 copies - 2 average
Thraben Inspector
2 copies - 2 average
Gideon, Ally of Zendikar
2 copies - 2 average
Ojutai's Command
2 copies - 2 average
Unsubstantiate
2 copies - 2 average
Negate
2 copies - 2 average
Bygone Bishop
2 copies - 2 average
Nebelgast Herald
1 copies - 1 average