Most played cards in UR Spell:

1 Decks
Fiery Impulse
4 copies - 4 average
Thermo-Alchemist
4 copies - 4 average
Shivan Reef
4 copies - 4 average
Fevered Visions
4 copies - 4 average
Wandering Fumarole
4 copies - 4 average
Incendiary Flow
4 copies - 4 average
Fiery Temper
4 copies - 4 average
Collective Defiance
4 copies - 4 average
Thing in the Ice
3 copies - 3 average
Goldnight Castigator
3 copies - 3 average
Nahiri's Wrath
3 copies - 3 average
Highland Lake
3 copies - 3 average
Dispel
3 copies - 3 average
Lightning Axe
3 copies - 3 average
Pieces of the Puzzle
2 copies - 2 average
Unsubstantiate
2 copies - 2 average
Spell Shrivel
2 copies - 2 average
Jace, Vryn's Prodigy
2 copies - 2 average
Summary Dismissal
1 copies - 1 average
Geier Reach Sanitarium
1 copies - 1 average