Most played cards in Red Deck Wins:

2 Decks
Lightning Bolt
8 copies - 4 average
Keldon Marauders
8 copies - 4 average
Hellspark Elemental
8 copies - 4 average
Goblin Guide
8 copies - 4 average
Rift Bolt
8 copies - 4 average
Lava Spike
8 copies - 4 average
Great Furnace
8 copies - 4 average
Shrapnel Blast
7 copies - 3.5 average
Blinkmoth Nexus
7 copies - 3.5 average
Ravenous Trap
6 copies - 3 average
Teetering Peaks
5 copies - 2.5 average
Magma Jet
4 copies - 2 average
Mogg Fanatic
4 copies - 2 average
Ghost Quarter
4 copies - 2 average
Shattering Spree
4 copies - 2 average
Smash to Smithereens
4 copies - 2 average
Relic of Progenitus
4 copies - 2 average
Molten Rain
4 copies - 2 average
Blood Moon
4 copies - 2 average
Spark Elemental
4 copies - 2 average