Most played cards in Tax:

1 Decks
Swords to Plowshares
4 copies - 4 average
Scroll Rack
4 copies - 4 average
Land Tax
4 copies - 4 average
Mox Diamond
4 copies - 4 average
Wasteland
4 copies - 4 average
Leyline of Sanctity
4 copies - 4 average
Windswept Heath
4 copies - 4 average
Ancient Tomb
4 copies - 4 average
Grafdigger's Cage
3 copies - 3 average
Surgical Extraction
3 copies - 3 average
Sorcerous Spyglass
3 copies - 3 average
Moat
3 copies - 3 average
Ghostly Prison
3 copies - 3 average
Snow-Covered Plains
3 copies - 3 average
Enlightened Tutor
3 copies - 3 average
Humility
3 copies - 3 average
Sterling Grove
2 copies - 2 average
Life from the Loam
2 copies - 2 average
Council's Judgment
2 copies - 2 average
Jester's Cap
1 copies - 1 average