Most played cards in Boros Deck Wins:

4 Decks
Calciderm
16 copies - 4 average
Rift Bolt
11 copies - 2.75 average
Sudden Shock
10 copies - 2.5 average
Cautery Sliver
8 copies - 2 average
Temporal Isolation
8 copies - 2 average
8 copies - 2 average
Knight of the Holy Nimbus
8 copies - 2 average
Disenchant
8 copies - 2 average
Stonecloaker
8 copies - 2 average
Sinew Sliver
8 copies - 2 average
Disintegrate
7 copies - 1.75 average
Honorable Passage
7 copies - 1.75 average
Griffin Guide
7 copies - 1.75 average
Icatian Javelineers
7 copies - 1.75 average
Gemstone Mine
7 copies - 1.75 average
Dead // Gone
7 copies - 1.75 average
Soltari Priest
7 copies - 1.75 average
Flagstones of Trokair
6 copies - 1.5 average
Keldon Marauders
6 copies - 1.5 average
Serra Avenger
5 copies - 1.25 average