Most played cards in Blue Engine:

2 Decks
Kraken Hatchling
8 copies - 4 average
Grand Architect
8 copies - 4 average
Preordain
7 copies - 3.5 average
Spell Pierce
6 copies - 3 average
Mindslaver
5 copies - 2.5 average
Everflowing Chalice
4 copies - 2 average
Lighthouse Chronologist
4 copies - 2 average
Treasure Mage
4 copies - 2 average
Mana Leak
4 copies - 2 average
Inkmoth Nexus
4 copies - 2 average
Halimar Depths
4 copies - 2 average
Aether Adept
4 copies - 2 average
Augury Owl
4 copies - 2 average
Wurmcoil Engine
4 copies - 2 average
Enclave Cryptologist
4 copies - 2 average
Contagion Engine
4 copies - 2 average
Stoic Rebuttal
4 copies - 2 average
Coralhelm Commander
4 copies - 2 average
Unsummon
3 copies - 1.5 average
Whiplash Trap
3 copies - 1.5 average