Most played cards in Eureka:

2 Decks
Birds of Paradise
8 copies - 4 average
Triskelion
8 copies - 4 average
Tropical Island
8 copies - 4 average
Eureka
8 copies - 4 average
City of Brass
8 copies - 4 average
Red Elemental Blast
7 copies - 3.5 average
Shivan Dragon
7 copies - 3.5 average
Taiga
7 copies - 3.5 average
Blue Elemental Blast
6 copies - 3 average
Bayou
5 copies - 2.5 average
Mahamoti Djinn
5 copies - 2.5 average
Erhnam Djinn
4 copies - 2 average
Clone
4 copies - 2 average
Sylvan Library
4 copies - 2 average
Earthquake
4 copies - 2 average
Concordant Crossroads
4 copies - 2 average
Fellwar Stone
4 copies - 2 average
Ice Storm
3 copies - 1.5 average
Gloom
3 copies - 1.5 average
Shatter
3 copies - 1.5 average