Most played cards in Mardu:

3 Decks
Disenchant
8 copies - 2.67 average
Badlands
8 copies - 2.67 average
Swords to Plowshares
8 copies - 2.67 average
Scrubland
8 copies - 2.67 average
Juzám Djinn
8 copies - 2.67 average
Hypnotic Specter
8 copies - 2.67 average
Sedge Troll
8 copies - 2.67 average
City of Brass
7 copies - 2.33 average
Red Elemental Blast
7 copies - 2.33 average
Lightning Bolt
7 copies - 2.33 average
Fellwar Stone
6 copies - 2 average
Underworld Dreams
5 copies - 1.67 average
Hymn to Tourach
4 copies - 1.33 average
Terror
3 copies - 1 average
Armageddon
3 copies - 1 average
Sinkhole
2 copies - 0.67 average
Sol Ring
2 copies - 0.67 average
Fireball
2 copies - 0.67 average
Strip Mine
2 copies - 0.67 average
Demonic Tutor
2 copies - 0.67 average