Most played cards in Guardian Beast:

1 Decks
City of Brass
4 copies - 4 average
Guardian Beast
4 copies - 4 average
Disenchant
4 copies - 4 average
Underground Sea
4 copies - 4 average
Tundra
4 copies - 4 average
Swords to Plowshares
4 copies - 4 average
Counterspell
4 copies - 4 average
Mishra's Factory
4 copies - 4 average
Red Elemental Blast
4 copies - 4 average
Fellwar Stone
3 copies - 3 average
Blue Elemental Blast
3 copies - 3 average
Ivory Tower
3 copies - 3 average
Jayemdae Tome
2 copies - 2 average
Transmute Artifact
2 copies - 2 average
The Abyss
1 copies - 1 average
Sol Ring
1 copies - 1 average
Regrowth
1 copies - 1 average
Recall
1 copies - 1 average
Nevinyrral's Disk
1 copies - 1 average
Time Walk
1 copies - 1 average