Most played cards in 4c Aggro:

1 Decks
Juggernaut
4 copies - 4 average
Serendib Efreet
4 copies - 4 average
Su-Chi
4 copies - 4 average
Tropical Island
4 copies - 4 average
Disenchant
4 copies - 4 average
Swords to Plowshares
4 copies - 4 average
City of Brass
4 copies - 4 average
Mishra's Factory
3 copies - 3 average
Tundra
3 copies - 3 average
Avoid Fate
3 copies - 3 average
Psionic Blast
2 copies - 2 average
Counterspell
2 copies - 2 average
Whirling Dervish
2 copies - 2 average
Control Magic
2 copies - 2 average
Circle of Protection: Red
2 copies - 2 average
Red Elemental Blast
2 copies - 2 average
Nevinyrral's Disk
2 copies - 2 average
Regrowth
1 copies - 1 average
Sol Ring
1 copies - 1 average
Sylvan Library
1 copies - 1 average