Most played cards in UR Burn:

1 Decks
Cryptic Command
4 copies - 4 average
Lightning Bolt
4 copies - 4 average
Remand
4 copies - 4 average
Opt
4 copies - 4 average
Scalding Tarn
4 copies - 4 average
Snapcaster Mage
4 copies - 4 average
Serum Visions
4 copies - 4 average
Thing in the Ice
4 copies - 4 average
Polluted Delta
3 copies - 3 average
Steam Vents
2 copies - 2 average
Dispel
2 copies - 2 average
Young Pyromancer
2 copies - 2 average
Surgical Extraction
2 copies - 2 average
Relic of Progenitus
2 copies - 2 average
Anger of the Gods
2 copies - 2 average
Sulfur Falls
2 copies - 2 average
Blood Moon
2 copies - 2 average
Spell Snare
2 copies - 2 average
Electrolyze
2 copies - 2 average
Abrade
2 copies - 2 average