Most played cards in Red Deck Wins:

1 Decks
Lightning Bolt
4 copies - 4 average
Lava Spike
4 copies - 4 average
Monastery Swiftspear
4 copies - 4 average
Lightning Helix
4 copies - 4 average
Rift Bolt
4 copies - 4 average
Destructive Revelry
4 copies - 4 average
Skullcrack
4 copies - 4 average
Searing Blaze
4 copies - 4 average
Goblin Guide
4 copies - 4 average
Boros Charm
4 copies - 4 average
Eidolon of the Great Revel
4 copies - 4 average
Inspiring Vantage
4 copies - 4 average
Path to Exile
3 copies - 3 average
Bloodstained Mire
3 copies - 3 average
Scalding Tarn
3 copies - 3 average
Wooded Foothills
3 copies - 3 average
Relic of Progenitus
2 copies - 2 average
Kor Firewalker
2 copies - 2 average
Ensnaring Bridge
2 copies - 2 average
Deflecting Palm
2 copies - 2 average