Most played cards in Zoo:

1 Decks
Rift Bolt
4 copies - 4 average
Mogg Fanatic
4 copies - 4 average
Stomping Ground
4 copies - 4 average
Temple Garden
4 copies - 4 average
Watchwolf
4 copies - 4 average
Lightning Helix
4 copies - 4 average
Sacred Foundry
4 copies - 4 average
Tarmogoyf
3 copies - 3 average
Seal of Fire
3 copies - 3 average
Battlefield Forge
3 copies - 3 average
Cryoclasm
3 copies - 3 average
Tin Street Hooligan
3 copies - 3 average
Temporal Isolation
3 copies - 3 average
Scab-Clan Mauler
3 copies - 3 average
Char
3 copies - 3 average
Keldon Marauders
3 copies - 3 average
Llanowar Elves
3 copies - 3 average
Griffin Guide
2 copies - 2 average
Stonecloaker
2 copies - 2 average
Threaten
2 copies - 2 average