Most played cards in Fish:

1 Decks
Hinterland Harbor
4 copies - 4 average
Delver of Secrets
4 copies - 4 average
Vapor Snag
4 copies - 4 average
Gitaxian Probe
4 copies - 4 average
Ponder
4 copies - 4 average
Quirion Dryad
4 copies - 4 average
Snapcaster Mage
4 copies - 4 average
Cavern of Souls
3 copies - 3 average
Phantasmal Image
3 copies - 3 average
Mana Leak
3 copies - 3 average
Mental Misstep
3 copies - 3 average
Thought Scour
3 copies - 3 average
Gut Shot
3 copies - 3 average
Crushing Vines
2 copies - 2 average
Negate
2 copies - 2 average
Surgical Extraction
2 copies - 2 average
Spectral Flight
2 copies - 2 average
Augur of Bolas
2 copies - 2 average
Talrand, Sky Summoner
2 copies - 2 average
Evolving Wilds
2 copies - 2 average