Most played cards in Red Spells:

1 Decks
Shock
4 copies - 4 average
Arclight Phoenix
4 copies - 4 average
Sulfur Falls
4 copies - 4 average
Opt
4 copies - 4 average
Steam Vents
4 copies - 4 average
Radical Idea
4 copies - 4 average
Crackling Drake
4 copies - 4 average
Lava Coil
4 copies - 4 average
Chart a Course
4 copies - 4 average
Goblin Electromancer
3 copies - 3 average
Shivan Fire
2 copies - 2 average
Murmuring Mystic
2 copies - 2 average
Negate
2 copies - 2 average
Tormenting Voice
2 copies - 2 average
Niv-Mizzet, Parun
2 copies - 2 average
Discovery // Dispersal
2 copies - 2 average
Entrancing Melody
2 copies - 2 average
Beacon Bolt
2 copies - 2 average
Star of Extinction
2 copies - 2 average
Ral, Izzet Viceroy
1 copies - 1 average