Most played cards in Stax:

2 Decks
Goblin Welder
8 copies - 4 average
Volcanic Island
8 copies - 4 average
Mishra's Workshop
8 copies - 4 average
Trinisphere
8 copies - 4 average
Smokestack
8 copies - 4 average
Tangle Wire
8 copies - 4 average
Wasteland
8 copies - 4 average
Chalice of the Void
7 copies - 3.5 average
Red Elemental Blast
7 copies - 3.5 average
Metalworker
6 copies - 3 average
Crucible of Worlds
4 copies - 2 average
Tormod's Crypt
4 copies - 2 average
Polluted Delta
4 copies - 2 average
Strip Mine
2 copies - 1 average
Cranial Extraction
2 copies - 1 average
2 copies - 1 average
Triskelion
2 copies - 1 average
Uba Mask
2 copies - 1 average
Sundering Titan
2 copies - 1 average
Blood Moon
2 copies - 1 average