Most played cards in Machinehead:

1 Decks
City of Brass
4 copies - 4 average
Hypnotic Specter
4 copies - 4 average
Bayou
4 copies - 4 average
Dark Ritual
4 copies - 4 average
Disenchant
4 copies - 4 average
Birds of Paradise
4 copies - 4 average
Juzám Djinn
4 copies - 4 average
Swords to Plowshares
4 copies - 4 average
Sengir Vampire
4 copies - 4 average
Berserk
3 copies - 3 average
Ice Storm
2 copies - 2 average
Red Elemental Blast
2 copies - 2 average
Blue Elemental Blast
2 copies - 2 average
Concordant Crossroads
1 copies - 1 average
Strip Mine
1 copies - 1 average
Library of Alexandria
1 copies - 1 average
Sol Ring
1 copies - 1 average
Tranquility
1 copies - 1 average
Taiga
1 copies - 1 average
Savannah
1 copies - 1 average