Most played cards in Stax:

4 Decks
City of Traitors
16 copies - 4 average
Ancient Tomb
16 copies - 4 average
Flagstones of Trokair
16 copies - 4 average
Mishra's Factory
16 copies - 4 average
Wasteland
16 copies - 4 average
Smokestack
16 copies - 4 average
Trinisphere
16 copies - 4 average
Chalice of the Void
16 copies - 4 average
Mox Diamond
16 copies - 4 average
Leyline of the Void
16 copies - 4 average
Humility
15 copies - 3.75 average
Crucible of Worlds
14 copies - 3.5 average
Karn, Scion of Urza
13 copies - 3.25 average
Armageddon
11 copies - 2.75 average
The Tabernacle at Pendrell Vale
9 copies - 2.25 average
Choke
9 copies - 2.25 average
Serum Powder
8 copies - 2 average
Snow-Covered Plains
7 copies - 1.75 average
Suppression Field
6 copies - 1.5 average
Tangle Wire
6 copies - 1.5 average