Most played cards in Arcum Dagsson:

3 Decks
Brainstorm
3 copies - 1 average
Counterspell
3 copies - 1 average
Negate
3 copies - 1 average
Spellskite
3 copies - 1 average
Silver Myr
3 copies - 1 average
Manakin
3 copies - 1 average
Millikin
3 copies - 1 average
Myr Retriever
3 copies - 1 average
Plague Myr
3 copies - 1 average
Pact of Negation
3 copies - 1 average
Swan Song
3 copies - 1 average
Academy Ruins
3 copies - 1 average
Rings of Brighthearth
3 copies - 1 average
Swiftfoot Boots
3 copies - 1 average
Thousand-Year Elixir
3 copies - 1 average
Myr Turbine
3 copies - 1 average
Lightning Greaves
3 copies - 1 average
Junk Diver
3 copies - 1 average
Thirst for Knowledge
3 copies - 1 average
Basalt Monolith
3 copies - 1 average