Most played cards in Mono Blue:

1 Decks
Snow-Covered Island
16 copies - 16 average
Remand
4 copies - 4 average
Disrupting Shoal
4 copies - 4 average
Opt
4 copies - 4 average
Sleight of Hand
4 copies - 4 average
Serum Visions
4 copies - 4 average
Snapcaster Mage
4 copies - 4 average
Thing in the Ice
4 copies - 4 average
Vapor Snag
4 copies - 4 average
Pteramander
4 copies - 4 average
Spreading Seas
3 copies - 3 average
Surgical Extraction
3 copies - 3 average
Commandeer
3 copies - 3 average
Psionic Blast
3 copies - 3 average
Cryptic Command
2 copies - 2 average
Vedalken Shackles
2 copies - 2 average
Spellskite
2 copies - 2 average
Vendilion Clique
1 copies - 1 average
Spell Pierce
1 copies - 1 average
Deprive
1 copies - 1 average