Most played cards in DragonBorn:

1 Decks
Polluted Delta
4 copies - 4 average
Dark Ritual
4 copies - 4 average
Underground Sea
4 copies - 4 average
Overload
4 copies - 4 average
Sickening Dreams
4 copies - 4 average
Pyroblast
4 copies - 4 average
Careful Study
4 copies - 4 average
Exhume
4 copies - 4 average
Bazaar of Baghdad
4 copies - 4 average
Squee, Goblin Nabob
3 copies - 3 average
Reanimate
3 copies - 3 average
Buried Alive
3 copies - 3 average
Defense Grid
3 copies - 3 average
Badlands
3 copies - 3 average
Animate Dead
3 copies - 3 average
Dragon Mage
2 copies - 2 average
Bladewing the Risen
2 copies - 2 average
Bladewing's Thrall
2 copies - 2 average
Time Walk
1 copies - 1 average
Sol Ring
1 copies - 1 average