Most played cards in UR Aggro:

1 Decks
Ponder
4 copies - 4 average
Lightning Bolt
4 copies - 4 average
Snapcaster Mage
4 copies - 4 average
Accumulated Knowledge
4 copies - 4 average
Thing in the Ice
4 copies - 4 average
Brainstorm
4 copies - 4 average
Force of Will
4 copies - 4 average
Scalding Tarn
4 copies - 4 average
Surgical Extraction
3 copies - 3 average
Pyroblast
3 copies - 3 average
Wasteland
3 copies - 3 average
Flooded Strand
3 copies - 3 average
Back to Basics
2 copies - 2 average
Counterbalance
2 copies - 2 average
Spell Snare
2 copies - 2 average
Hydroblast
2 copies - 2 average
Preordain
2 copies - 2 average
Jace, the Mind Sculptor
2 copies - 2 average
Daze
2 copies - 2 average
Volcanic Island
2 copies - 2 average