Most played cards in RW Aggro:

5 Decks
Lightning Bolt
20 copies - 4 average
Plateau
20 copies - 4 average
Disenchant
19 copies - 3.8 average
Chain Lightning
15 copies - 3 average
Savannah Lions
15 copies - 3 average
Swords to Plowshares
14 copies - 2.8 average
Red Elemental Blast
13 copies - 2.6 average
Divine Offering
9 copies - 1.8 average
Black Vise
8 copies - 1.6 average
Icatian Javelineers
7 copies - 1.4 average
Mishra's Factory
7 copies - 1.4 average
Land Tax
7 copies - 1.4 average
Serra Angel
6 copies - 1.2 average
Granite Gargoyle
6 copies - 1.2 average
City in a Bottle
6 copies - 1.2 average
Blood Moon
5 copies - 1 average
Strip Mine
5 copies - 1 average
Jackal Pup
4 copies - 0.8 average
Su-Chi
4 copies - 0.8 average
Volcanic Island
4 copies - 0.8 average