Most played cards in Mono Blue Artifacts:

2 Decks
Emry, Lurker of the Loch
8 copies - 4 average
Chalice of the Void
8 copies - 4 average
Urza's Bauble
8 copies - 4 average
Mishra's Bauble
8 copies - 4 average
Thought Monitor
8 copies - 4 average
Force of Will
8 copies - 4 average
Urza's Saga
8 copies - 4 average
Ancient Tomb
8 copies - 4 average
Seat of the Synod
8 copies - 4 average
Thoughtcast
8 copies - 4 average
Lotus Petal
8 copies - 4 average
Mox Opal
7 copies - 3.5 average
Dismember
6 copies - 3 average
Force of Negation
5 copies - 2.5 average
Kappa Cannoneer
5 copies - 2.5 average
Otawara, Soaring City
4 copies - 2 average
Sai, Master Thopterist
4 copies - 2 average
Haywire Mite
2 copies - 1 average
Pithing Needle
2 copies - 1 average
Grafdigger's Cage
2 copies - 1 average