Most played cards in Zoo:

1 Decks
Savannah Lions
4 copies - 4 average
Mogg Fanatic
4 copies - 4 average
Incinerate
4 copies - 4 average
Goblin Legionnaire
4 copies - 4 average
Jackal Pup
4 copies - 4 average
Lightning Bolt
4 copies - 4 average
Wasteland
4 copies - 4 average
Land Tax
4 copies - 4 average
Battlefield Forge
4 copies - 4 average
Swords to Plowshares
4 copies - 4 average
Fireblast
3 copies - 3 average
Armageddon
3 copies - 3 average
Sulfuric Vortex
2 copies - 2 average
Pyrokinesis
2 copies - 2 average
Tormod's Crypt
2 copies - 2 average
Seismic Assault
2 copies - 2 average
Mother of Runes
2 copies - 2 average
Grim Lavamancer
2 copies - 2 average
Disenchant
2 copies - 2 average
Seal of Cleansing
2 copies - 2 average