Most played cards in Dreadnought:

1 Decks
Brainstorm
4 copies - 4 average
Force of Will
4 copies - 4 average
Swords to Plowshares
4 copies - 4 average
Flooded Strand
4 copies - 4 average
Wasteland
4 copies - 4 average
Phyrexian Dreadnought
3 copies - 3 average
Ponder
3 copies - 3 average
Dress Down
3 copies - 3 average
Doorkeeper Thrull
3 copies - 3 average
Tamiyo, Inquisitive Student
2 copies - 2 average
Daze
2 copies - 2 average
Prismatic Ending
2 copies - 2 average
Nulldrifter
2 copies - 2 average
Tundra
2 copies - 2 average
Volcanic Island
2 copies - 2 average
Harbinger of the Seas
1 copies - 1 average
Wrath of the Skies
1 copies - 1 average
Triumph of Saint Katherine
1 copies - 1 average
Hydroblast
1 copies - 1 average
Red Elemental Blast
1 copies - 1 average