Most played cards in Death and Taxes:

1 Decks
Aether Vial
4 copies - 4 average
Thalia, Guardian of Thraben
4 copies - 4 average
Rishadan Port
4 copies - 4 average
Wasteland
4 copies - 4 average
Ethersworn Canonist
4 copies - 4 average
Stoneforge Mystic
4 copies - 4 average
Swords to Plowshares
4 copies - 4 average
Phyrexian Revoker
4 copies - 4 average
Mother of Runes
4 copies - 4 average
Kor Firewalker
3 copies - 3 average
Serra Avenger
3 copies - 3 average
Karakas
3 copies - 3 average
Mirran Crusader
3 copies - 3 average
Flickerwisp
2 copies - 2 average
Aven Mindcensor
2 copies - 2 average
Leonin Relic-Warder
2 copies - 2 average
Wilt-Leaf Liege
2 copies - 2 average
Sunlance
2 copies - 2 average
Manriki-Gusari
1 copies - 1 average
Umezawa's Jitte
1 copies - 1 average