Most played cards in Zoo:

3 Decks
Terramorphic Expanse
12 copies - 4 average
Lightning Bolt
11 copies - 3.67 average
Rancor
8 copies - 2.67 average
Pyroblast
8 copies - 2.67 average
Nylea's Presence
8 copies - 2.67 average
Wild Nacatl
8 copies - 2.67 average
Squadron Hawk
8 copies - 2.67 average
Tribal Flames
8 copies - 2.67 average
Abundant Growth
7 copies - 2.33 average
Matca Rioters
7 copies - 2.33 average
Evolving Wilds
7 copies - 2.33 average
Kird Ape
6 copies - 2 average
Electrickery
6 copies - 2 average
Kor Skyfisher
6 copies - 2 average
Unearth
5 copies - 1.67 average
Gorilla Shaman
5 copies - 1.67 average
Moldgraf Scavenger
4 copies - 1.33 average
Ray of Revelation
4 copies - 1.33 average
Basking Rootwalla
4 copies - 1.33 average
Wild Mongrel
4 copies - 1.33 average