Most played cards in Arcum Dagsson:

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